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-rw-r--r--app/controllers/admin/announcements_controller.rb69
-rw-r--r--app/controllers/api/base_controller.rb2
-rw-r--r--app/controllers/api/v1/announcements/reactions_controller.rb29
-rw-r--r--app/controllers/api/v1/announcements_controller.rb33
-rw-r--r--app/helpers/admin/action_logs_helper.rb8
-rw-r--r--app/helpers/admin/announcements_helper.rb11
-rw-r--r--app/helpers/admin/filter_helper.rb1
-rw-r--r--app/javascript/images/elephant_ui_plane.svg2
-rw-r--r--app/javascript/mastodon/actions/announcements.js133
-rw-r--r--app/javascript/mastodon/actions/importer/normalizer.js10
-rw-r--r--app/javascript/mastodon/actions/notifications.js3
-rw-r--r--app/javascript/mastodon/actions/streaming.js11
-rw-r--r--app/javascript/mastodon/actions/timelines.js2
-rw-r--r--app/javascript/mastodon/components/error_boundary.js2
-rw-r--r--app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js7
-rw-r--r--app/javascript/mastodon/features/getting_started/components/announcements.js395
-rw-r--r--app/javascript/mastodon/features/getting_started/containers/announcements_container.js21
-rw-r--r--app/javascript/mastodon/features/getting_started/containers/trends_container.js2
-rw-r--r--app/javascript/mastodon/features/home_timeline/index.js3
-rw-r--r--app/javascript/mastodon/features/ui/components/media_modal.js1
-rw-r--r--app/javascript/mastodon/reducers/announcements.js72
-rw-r--r--app/javascript/mastodon/reducers/index.js2
-rw-r--r--app/javascript/styles/mastodon/components.scss213
-rw-r--r--app/javascript/styles/mastodon/forms.scss6
-rw-r--r--app/lib/entity_cache.rb2
-rw-r--r--app/lib/inline_renderer.rb4
-rw-r--r--app/models/account.rb6
-rw-r--r--app/models/announcement.rb85
-rw-r--r--app/models/announcement_filter.rb39
-rw-r--r--app/models/announcement_mute.rb19
-rw-r--r--app/models/announcement_reaction.rb37
-rw-r--r--app/models/backup.rb2
-rw-r--r--app/models/bookmark.rb6
-rw-r--r--app/models/concerns/account_interactions.rb1
-rw-r--r--app/models/custom_emoji.rb2
-rw-r--r--app/policies/announcement_policy.rb19
-rw-r--r--app/serializers/rest/announcement_serializer.rb34
-rw-r--r--app/serializers/rest/reaction_serializer.rb31
-rw-r--r--app/validators/reaction_validator.rb17
-rw-r--r--app/views/admin/announcements/_announcement.html.haml14
-rw-r--r--app/views/admin/announcements/edit.html.haml22
-rw-r--r--app/views/admin/announcements/index.html.haml30
-rw-r--r--app/views/admin/announcements/new.html.haml21
-rw-r--r--app/workers/publish_announcement_reaction_worker.rb22
-rw-r--r--app/workers/publish_scheduled_announcement_worker.rb18
-rw-r--r--app/workers/scheduler/scheduled_statuses_scheduler.rb28
-rw-r--r--config/initializers/simple_form.rb2
-rw-r--r--config/locales/en.yml22
-rw-r--r--config/locales/simple_form.en.yml12
-rw-r--r--config/navigation.rb1
-rw-r--r--config/routes.rb13
-rw-r--r--db/migrate/20191218153258_create_announcements.rb16
-rw-r--r--db/migrate/20200113125135_create_announcement_mutes.rb12
-rw-r--r--db/migrate/20200114113335_create_announcement_reactions.rb15
-rw-r--r--db/schema.rb41
-rw-r--r--lib/tasks/auto_annotate_models.rake1
-rw-r--r--spec/controllers/api/v1/announcements/reactions_controller_spec.rb65
-rw-r--r--spec/controllers/api/v1/announcements_controller_spec.rb59
-rw-r--r--spec/controllers/api/v1/trends_controller_spec.rb18
-rw-r--r--spec/fabricators/announcement_fabricator.rb6
-rw-r--r--spec/fabricators/announcement_mute_fabricator.rb4
-rw-r--r--spec/fabricators/announcement_reaction_fabricator.rb5
-rw-r--r--spec/models/announcement_mute_spec.rb4
-rw-r--r--spec/models/announcement_reaction_spec.rb4
-rw-r--r--spec/models/announcement_spec.rb4
65 files changed, 1779 insertions, 22 deletions
diff --git a/app/controllers/admin/announcements_controller.rb b/app/controllers/admin/announcements_controller.rb
new file mode 100644
index 000000000..02198f0b5
--- /dev/null
+++ b/app/controllers/admin/announcements_controller.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+class Admin::AnnouncementsController < Admin::BaseController
+  before_action :set_announcements, only: :index
+  before_action :set_announcement, except: [:index, :new, :create]
+
+  def index
+    authorize :announcement, :index?
+  end
+
+  def new
+    authorize :announcement, :create?
+
+    @announcement = Announcement.new
+  end
+
+  def create
+    authorize :announcement, :create?
+
+    @announcement = Announcement.new(resource_params)
+
+    if @announcement.save
+      log_action :create, @announcement
+      redirect_to admin_announcements_path
+    else
+      render :new
+    end
+  end
+
+  def edit
+    authorize :announcement, :update?
+  end
+
+  def update
+    authorize :announcement, :update?
+
+    if @announcement.update(resource_params)
+      log_action :update, @announcement
+      redirect_to admin_announcements_path
+    else
+      render :edit
+    end
+  end
+
+  def destroy
+    authorize :announcement, :destroy?
+    @announcement.destroy!
+    log_action :destroy, @announcement
+    redirect_to admin_announcements_path
+  end
+
+  private
+
+  def set_announcements
+    @announcements = AnnouncementFilter.new(filter_params).results.page(params[:page])
+  end
+
+  def set_announcement
+    @announcement = Announcement.find(params[:id])
+  end
+
+  def filter_params
+    params.slice(*AnnouncementFilter::KEYS).permit(*AnnouncementFilter::KEYS)
+  end
+
+  def resource_params
+    params.require(:announcement).permit(:text, :scheduled_at, :starts_at, :ends_at, :all_day)
+  end
+end
diff --git a/app/controllers/api/base_controller.rb b/app/controllers/api/base_controller.rb
index 144fdd6ac..68bf425f4 100644
--- a/app/controllers/api/base_controller.rb
+++ b/app/controllers/api/base_controller.rb
@@ -85,7 +85,7 @@ class Api::BaseController < ApplicationController
   end
 
   def require_authenticated_user!
-    render json: { error: 'This API requires an authenticated user' }, status: 401 unless current_user
+    render json: { error: 'This method requires an authenticated user' }, status: 401 unless current_user
   end
 
   def require_user!
diff --git a/app/controllers/api/v1/announcements/reactions_controller.rb b/app/controllers/api/v1/announcements/reactions_controller.rb
new file mode 100644
index 000000000..e4a72e595
--- /dev/null
+++ b/app/controllers/api/v1/announcements/reactions_controller.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Api::V1::Announcements::ReactionsController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :write, :'write:favourites' }
+  before_action :require_user!
+
+  before_action :set_announcement
+  before_action :set_reaction, except: :update
+
+  def update
+    @announcement.announcement_reactions.create!(account: current_account, name: params[:id])
+    render_empty
+  end
+
+  def destroy
+    @reaction.destroy!
+    render_empty
+  end
+
+  private
+
+  def set_reaction
+    @reaction = @announcement.announcement_reactions.where(account: current_account).find_by!(name: params[:id])
+  end
+
+  def set_announcement
+    @announcement = Announcement.published.find(params[:announcement_id])
+  end
+end
diff --git a/app/controllers/api/v1/announcements_controller.rb b/app/controllers/api/v1/announcements_controller.rb
new file mode 100644
index 000000000..6724fac2e
--- /dev/null
+++ b/app/controllers/api/v1/announcements_controller.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Api::V1::AnnouncementsController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :write, :'write:accounts' }, only: :dismiss
+  before_action :require_user!
+  before_action :set_announcements, only: :index
+  before_action :set_announcement, except: :index
+
+  def index
+    render json: @announcements, each_serializer: REST::AnnouncementSerializer
+  end
+
+  def dismiss
+    AnnouncementMute.create!(account: current_account, announcement: @announcement)
+    render_empty
+  end
+
+  private
+
+  def set_announcements
+    @announcements = begin
+      scope = Announcement.published
+
+      scope.merge!(Announcement.without_muted(current_account)) unless truthy_param?(:with_dismissed)
+
+      scope.chronological
+    end
+  end
+
+  def set_announcement
+    @announcement = Announcement.published.find(params[:id])
+  end
+end
diff --git a/app/helpers/admin/action_logs_helper.rb b/app/helpers/admin/action_logs_helper.rb
index 608a99dd5..6bc75aa56 100644
--- a/app/helpers/admin/action_logs_helper.rb
+++ b/app/helpers/admin/action_logs_helper.rb
@@ -22,6 +22,8 @@ module Admin::ActionLogsHelper
       log.recorded_changes.slice('severity', 'reject_media')
     elsif log.target_type == 'Status' && log.action == :update
       log.recorded_changes.slice('sensitive')
+    elsif log.target_type == 'Announcement' && log.action == :update
+      log.recorded_changes.slice('text', 'starts_at', 'ends_at', 'all_day')
     end
   end
 
@@ -52,6 +54,8 @@ module Admin::ActionLogsHelper
       'pencil'
     when 'AccountWarning'
       'warning'
+    when 'Announcement'
+      'bullhorn'
     end
   end
 
@@ -94,6 +98,8 @@ module Admin::ActionLogsHelper
       link_to record.account.acct, ActivityPub::TagManager.instance.url_for(record)
     when 'AccountWarning'
       link_to record.target_account.acct, admin_account_path(record.target_account_id)
+    when 'Announcement'
+      link_to "##{record.id}", edit_admin_announcement_path(record.id)
     end
   end
 
@@ -111,6 +117,8 @@ module Admin::ActionLogsHelper
       else
         I18n.t('admin.action_logs.deleted_status')
       end
+    when 'Announcement'
+      "##{attributes['id']}"
     end
   end
 end
diff --git a/app/helpers/admin/announcements_helper.rb b/app/helpers/admin/announcements_helper.rb
new file mode 100644
index 000000000..0c053ddec
--- /dev/null
+++ b/app/helpers/admin/announcements_helper.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Admin::AnnouncementsHelper
+  def time_range(announcement)
+    if announcement.all_day?
+      safe_join([l(announcement.starts_at.to_date), ' - ', l(announcement.ends_at.to_date)])
+    else
+      safe_join([l(announcement.starts_at), ' - ', l(announcement.ends_at)])
+    end
+  end
+end
diff --git a/app/helpers/admin/filter_helper.rb b/app/helpers/admin/filter_helper.rb
index 130686a02..6ab92939d 100644
--- a/app/helpers/admin/filter_helper.rb
+++ b/app/helpers/admin/filter_helper.rb
@@ -9,6 +9,7 @@ module Admin::FilterHelper
     InstanceFilter::KEYS,
     InviteFilter::KEYS,
     RelationshipFilter::KEYS,
+    AnnouncementFilter::KEYS,
   ].flatten.freeze
 
   def filter_link_to(text, link_to_params, link_class_params = link_to_params)
diff --git a/app/javascript/images/elephant_ui_plane.svg b/app/javascript/images/elephant_ui_plane.svg
index a2624d170..ca675c9eb 100644
--- a/app/javascript/images/elephant_ui_plane.svg
+++ b/app/javascript/images/elephant_ui_plane.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 292.85862 204.49997" width="292.85861" height="204.49997"><g transform="translate(-395.89999 -820.4)"><defs><path id="a" d="M395.89999 745.09998H690.5v279.79999H395.89999z"/></defs><clipPath id="b"><use xlink:href="#a" width="100%" height="100%" overflow="visible"/></clipPath><path class="st53" d="M339.3 1028.6c1.5-3.2 14.4-31.3 27.4-58.8-6-9.3-2-17 1.5-23.7 1.9-3.7 3.8-7.1 3.6-10.4-.8-22 8.1-38.3 22.8-41.6 2.8-.6 5.2-.9 7.5-.9 3 0 5.6.5 8.1 1.6 1.4-1.3 2.8-2.6 4.2-3.8-2.8-2.6-4.3-5.5-4.5-8.8-.3-4.5 2.2-9.5 6.8-13.7 5.3-4.8 16.5-12.9 31.7-12.9.9 0 1.7 0 2.6.1-.4-.9-1-2-2.1-2.9-2.1-1.6-1.9-3.2-1.6-4 .7-2.1 3.6-3.2 8.1-3.2 3.9 0 9.7 1.2 14 4.4.3-.7.7-1.3 1.3-1.7.5-.3 1.3-.5 2.2-.5 3.4 0 10.6 2.7 15.5 9.9 3.6 5.3 3.6 10.8.1 16 18.3 4.7 30.1 15.6 39.5 24.4 2.5 2.4 5 4.6 7.3 6.5 10.7 8.9 21.4 13.2 32.7 13.2.9 0 1.8 0 2.7-.1 2-13.5-4.1-25.5-10-35.7-6.2-10.7-6.4-12.1-4.9-13.9l.1-.1c.6-.7 1.3-1 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diff --git a/app/javascript/mastodon/actions/announcements.js b/app/javascript/mastodon/actions/announcements.js
new file mode 100644
index 000000000..c65bc052e
--- /dev/null
+++ b/app/javascript/mastodon/actions/announcements.js
@@ -0,0 +1,133 @@
+import api from '../api';
+import { normalizeAnnouncement } from './importer/normalizer';
+
+export const ANNOUNCEMENTS_FETCH_REQUEST = 'ANNOUNCEMENTS_FETCH_REQUEST';
+export const ANNOUNCEMENTS_FETCH_SUCCESS = 'ANNOUNCEMENTS_FETCH_SUCCESS';
+export const ANNOUNCEMENTS_FETCH_FAIL    = 'ANNOUNCEMENTS_FETCH_FAIL';
+export const ANNOUNCEMENTS_UPDATE        = 'ANNOUNCEMENTS_UPDATE';
+export const ANNOUNCEMENTS_DISMISS       = 'ANNOUNCEMENTS_DISMISS';
+
+export const ANNOUNCEMENTS_REACTION_ADD_REQUEST = 'ANNOUNCEMENTS_REACTION_ADD_REQUEST';
+export const ANNOUNCEMENTS_REACTION_ADD_SUCCESS = 'ANNOUNCEMENTS_REACTION_ADD_SUCCESS';
+export const ANNOUNCEMENTS_REACTION_ADD_FAIL    = 'ANNOUNCEMENTS_REACTION_ADD_FAIL';
+
+export const ANNOUNCEMENTS_REACTION_REMOVE_REQUEST = 'ANNOUNCEMENTS_REACTION_REMOVE_REQUEST';
+export const ANNOUNCEMENTS_REACTION_REMOVE_SUCCESS = 'ANNOUNCEMENTS_REACTION_REMOVE_SUCCESS';
+export const ANNOUNCEMENTS_REACTION_REMOVE_FAIL    = 'ANNOUNCEMENTS_REACTION_REMOVE_FAIL';
+
+export const ANNOUNCEMENTS_REACTION_UPDATE = 'ANNOUNCEMENTS_REACTION_UPDATE';
+
+const noOp = () => {};
+
+export const fetchAnnouncements = (done = noOp) => (dispatch, getState) => {
+  dispatch(fetchAnnouncementsRequest());
+
+  api(getState).get('/api/v1/announcements').then(response => {
+    dispatch(fetchAnnouncementsSuccess(response.data.map(x => normalizeAnnouncement(x))));
+  }).catch(error => {
+    dispatch(fetchAnnouncementsFail(error));
+  }).finally(() => {
+    done();
+  });
+};
+
+export const fetchAnnouncementsRequest = () => ({
+  type: ANNOUNCEMENTS_FETCH_REQUEST,
+  skipLoading: true,
+});
+
+export const fetchAnnouncementsSuccess = announcements => ({
+  type: ANNOUNCEMENTS_FETCH_SUCCESS,
+  announcements,
+  skipLoading: true,
+});
+
+export const fetchAnnouncementsFail= error => ({
+  type: ANNOUNCEMENTS_FETCH_FAIL,
+  error,
+  skipLoading: true,
+  skipAlert: true,
+});
+
+export const updateAnnouncements = announcement => ({
+  type: ANNOUNCEMENTS_UPDATE,
+  announcement: normalizeAnnouncement(announcement),
+});
+
+export const dismissAnnouncement = announcementId => (dispatch, getState) => {
+  dispatch({
+    type: ANNOUNCEMENTS_DISMISS,
+    id: announcementId,
+  });
+
+  api(getState).post(`/api/v1/announcements/${announcementId}/dismiss`);
+};
+
+export const addReaction = (announcementId, name) => (dispatch, getState) => {
+  dispatch(addReactionRequest(announcementId, name));
+
+  api(getState).put(`/api/v1/announcements/${announcementId}/reactions/${name}`).then(() => {
+    dispatch(addReactionSuccess(announcementId, name));
+  }).catch(err => {
+    dispatch(addReactionFail(announcementId, name, err));
+  });
+};
+
+export const addReactionRequest = (announcementId, name) => ({
+  type: ANNOUNCEMENTS_REACTION_ADD_REQUEST,
+  id: announcementId,
+  name,
+  skipLoading: true,
+});
+
+export const addReactionSuccess = (announcementId, name) => ({
+  type: ANNOUNCEMENTS_REACTION_ADD_SUCCESS,
+  id: announcementId,
+  name,
+  skipLoading: true,
+});
+
+export const addReactionFail = (announcementId, name, error) => ({
+  type: ANNOUNCEMENTS_REACTION_ADD_FAIL,
+  id: announcementId,
+  name,
+  error,
+  skipLoading: true,
+});
+
+export const removeReaction = (announcementId, name) => (dispatch, getState) => {
+  dispatch(removeReactionRequest(announcementId, name));
+
+  api(getState).delete(`/api/v1/announcements/${announcementId}/reactions/${name}`).then(() => {
+    dispatch(removeReactionSuccess(announcementId, name));
+  }).catch(err => {
+    dispatch(removeReactionFail(announcementId, name, err));
+  });
+};
+
+export const removeReactionRequest = (announcementId, name) => ({
+  type: ANNOUNCEMENTS_REACTION_REMOVE_REQUEST,
+  id: announcementId,
+  name,
+  skipLoading: true,
+});
+
+export const removeReactionSuccess = (announcementId, name) => ({
+  type: ANNOUNCEMENTS_REACTION_REMOVE_SUCCESS,
+  id: announcementId,
+  name,
+  skipLoading: true,
+});
+
+export const removeReactionFail = (announcementId, name, error) => ({
+  type: ANNOUNCEMENTS_REACTION_REMOVE_FAIL,
+  id: announcementId,
+  name,
+  error,
+  skipLoading: true,
+});
+
+export const updateReaction = reaction => ({
+  type: ANNOUNCEMENTS_REACTION_UPDATE,
+  reaction,
+});
diff --git a/app/javascript/mastodon/actions/importer/normalizer.js b/app/javascript/mastodon/actions/importer/normalizer.js
index 78f321da4..f7cbe4c1c 100644
--- a/app/javascript/mastodon/actions/importer/normalizer.js
+++ b/app/javascript/mastodon/actions/importer/normalizer.js
@@ -76,7 +76,6 @@ export function normalizeStatus(status, normalOldStatus) {
 
 export function normalizePoll(poll) {
   const normalPoll = { ...poll };
-
   const emojiMap = makeEmojiMap(normalPoll);
 
   normalPoll.options = poll.options.map((option, index) => ({
@@ -87,3 +86,12 @@ export function normalizePoll(poll) {
 
   return normalPoll;
 }
+
+export function normalizeAnnouncement(announcement) {
+  const normalAnnouncement = { ...announcement };
+  const emojiMap = makeEmojiMap(normalAnnouncement);
+
+  normalAnnouncement.contentHtml = emojify(normalAnnouncement.content, emojiMap);
+
+  return normalAnnouncement;
+}
diff --git a/app/javascript/mastodon/actions/notifications.js b/app/javascript/mastodon/actions/notifications.js
index 798f9b37e..8a066b896 100644
--- a/app/javascript/mastodon/actions/notifications.js
+++ b/app/javascript/mastodon/actions/notifications.js
@@ -157,9 +157,9 @@ export function expandNotifications({ maxId } = {}, done = noOp) {
 
       dispatch(expandNotificationsSuccess(response.data, next ? next.uri : null, isLoadingMore, isLoadingRecent, isLoadingRecent && preferPendingItems));
       fetchRelatedRelationships(dispatch, response.data);
-      done();
     }).catch(error => {
       dispatch(expandNotificationsFail(error, isLoadingMore));
+    }).finally(() => {
       done();
     });
   };
@@ -188,6 +188,7 @@ export function expandNotificationsFail(error, isLoadingMore) {
     type: NOTIFICATIONS_EXPAND_FAIL,
     error,
     skipLoading: !isLoadingMore,
+    skipAlert: !isLoadingMore,
   };
 };
 
diff --git a/app/javascript/mastodon/actions/streaming.js b/app/javascript/mastodon/actions/streaming.js
index c678e9393..ac325f74c 100644
--- a/app/javascript/mastodon/actions/streaming.js
+++ b/app/javascript/mastodon/actions/streaming.js
@@ -8,6 +8,7 @@ import {
 } from './timelines';
 import { updateNotifications, expandNotifications } from './notifications';
 import { updateConversations } from './conversations';
+import { fetchAnnouncements, updateAnnouncements, updateReaction as updateAnnouncementsReaction } from './announcements';
 import { fetchFilters } from './filters';
 import { getLocale } from '../locales';
 
@@ -44,6 +45,12 @@ export function connectTimelineStream (timelineId, path, pollingRefresh = null,
         case 'filters_changed':
           dispatch(fetchFilters());
           break;
+        case 'announcement':
+          dispatch(updateAnnouncements(JSON.parse(data.payload)));
+          break;
+        case 'announcement.reaction':
+          dispatch(updateAnnouncementsReaction(JSON.parse(data.payload)));
+          break;
         }
       },
     };
@@ -51,7 +58,9 @@ export function connectTimelineStream (timelineId, path, pollingRefresh = null,
 }
 
 const refreshHomeTimelineAndNotification = (dispatch, done) => {
-  dispatch(expandHomeTimeline({}, () => dispatch(expandNotifications({}, done))));
+  dispatch(expandHomeTimeline({}, () =>
+    dispatch(expandNotifications({}, () =>
+      dispatch(fetchAnnouncements(done))))));
 };
 
 export const connectUserStream      = () => connectTimelineStream('home', 'user', refreshHomeTimelineAndNotification);
diff --git a/app/javascript/mastodon/actions/timelines.js b/app/javascript/mastodon/actions/timelines.js
index bc2ac5e82..054668655 100644
--- a/app/javascript/mastodon/actions/timelines.js
+++ b/app/javascript/mastodon/actions/timelines.js
@@ -98,9 +98,9 @@ export function expandTimeline(timelineId, path, params = {}, done = noOp) {
       const next = getLinks(response).refs.find(link => link.rel === 'next');
       dispatch(importFetchedStatuses(response.data));
       dispatch(expandTimelineSuccess(timelineId, response.data, next ? next.uri : null, response.status === 206, isLoadingRecent, isLoadingMore, isLoadingRecent && preferPendingItems));
-      done();
     }).catch(error => {
       dispatch(expandTimelineFail(timelineId, error, isLoadingMore));
+    }).finally(() => {
       done();
     });
   };
diff --git a/app/javascript/mastodon/components/error_boundary.js b/app/javascript/mastodon/components/error_boundary.js
index 800b1c270..4e1c882e2 100644
--- a/app/javascript/mastodon/components/error_boundary.js
+++ b/app/javascript/mastodon/components/error_boundary.js
@@ -58,7 +58,7 @@ export default class ErrorBoundary extends React.PureComponent {
         <div>
           <p className='error-boundary__error'><FormattedMessage id='error.unexpected_crash.explanation' defaultMessage='Due to a bug in our code or a browser compatibility issue, this page could not be displayed correctly.' /></p>
           <p><FormattedMessage id='error.unexpected_crash.next_steps' defaultMessage='Try refreshing the page. If that does not help, you may still be able to use Mastodon through a different browser or native app.' /></p>
-          <p className='error-boundary__footer'>Mastodon v{version} · <a href={source_url} rel='noopener noreferrer' target='_blank'><FormattedMessage id='errors.unexpected_crash.report_issue' defaultMessage='Report issue' /></a> · <button onClick={this.handleCopyStackTrace} className={copied && 'copied'}><FormattedMessage id='errors.unexpected_crash.copy_stacktrace' defaultMessage='Copy stacktrace to clipboard' /></button></p>
+          <p className='error-boundary__footer'>Mastodon v{version} · <a href={source_url} rel='noopener noreferrer' target='_blank'><FormattedMessage id='errors.unexpected_crash.report_issue' defaultMessage='Report issue' /></a> · <button onClick={this.handleCopyStackTrace} className={copied ? 'copied' : ''}><FormattedMessage id='errors.unexpected_crash.copy_stacktrace' defaultMessage='Copy stacktrace to clipboard' /></button></p>
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js b/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
index e57c3c20c..582bb0d39 100644
--- a/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
@@ -290,6 +290,7 @@ class EmojiPickerDropdown extends React.PureComponent {
     onPickEmoji: PropTypes.func.isRequired,
     onSkinTone: PropTypes.func.isRequired,
     skinTone: PropTypes.number.isRequired,
+    button: PropTypes.node,
   };
 
   state = {
@@ -350,18 +351,18 @@ class EmojiPickerDropdown extends React.PureComponent {
   }
 
   render () {
-    const { intl, onPickEmoji, onSkinTone, skinTone, frequentlyUsedEmojis } = this.props;
+    const { intl, onPickEmoji, onSkinTone, skinTone, frequentlyUsedEmojis, button } = this.props;
     const title = intl.formatMessage(messages.emoji);
     const { active, loading, placement } = this.state;
 
     return (
       <div className='emoji-picker-dropdown' onKeyDown={this.handleKeyDown}>
         <div ref={this.setTargetRef} className='emoji-button' title={title} aria-label={title} aria-expanded={active} role='button' onClick={this.onToggle} onKeyDown={this.onToggle} tabIndex={0}>
-          <img
+          {button || <img
             className={classNames('emojione', { 'pulse-loading': active && loading })}
             alt='🙂'
             src={`${assetHost}/emoji/1f602.svg`}
-          />
+          />}
         </div>
 
         <Overlay show={active} placement={placement} target={this.findTarget}>
diff --git a/app/javascript/mastodon/features/getting_started/components/announcements.js b/app/javascript/mastodon/features/getting_started/components/announcements.js
new file mode 100644
index 000000000..ee444e3f0
--- /dev/null
+++ b/app/javascript/mastodon/features/getting_started/components/announcements.js
@@ -0,0 +1,395 @@
+import React from 'react';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import ReactSwipeableViews from 'react-swipeable-views';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import PropTypes from 'prop-types';
+import IconButton from 'mastodon/components/icon_button';
+import Icon from 'mastodon/components/icon';
+import { defineMessages, injectIntl, FormattedMessage, FormattedDate, FormattedNumber } from 'react-intl';
+import { autoPlayGif } from 'mastodon/initial_state';
+import elephantUIPlane from 'mastodon/../images/elephant_ui_plane.svg';
+import { mascot } from 'mastodon/initial_state';
+import unicodeMapping from 'mastodon/features/emoji/emoji_unicode_mapping_light';
+import classNames from 'classnames';
+import EmojiPickerDropdown from 'mastodon/features/compose/containers/emoji_picker_dropdown_container';
+
+const messages = defineMessages({
+  close: { id: 'lightbox.close', defaultMessage: 'Close' },
+  previous: { id: 'lightbox.previous', defaultMessage: 'Previous' },
+  next: { id: 'lightbox.next', defaultMessage: 'Next' },
+});
+
+class Content extends ImmutablePureComponent {
+
+  static contextTypes = {
+    router: PropTypes.object,
+  };
+
+  static propTypes = {
+    announcement: ImmutablePropTypes.map.isRequired,
+  };
+
+  setRef = c => {
+    this.node = c;
+  }
+
+  componentDidMount () {
+    this._updateLinks();
+    this._updateEmojis();
+  }
+
+  componentDidUpdate () {
+    this._updateLinks();
+    this._updateEmojis();
+  }
+
+  _updateEmojis () {
+    const node = this.node;
+
+    if (!node || autoPlayGif) {
+      return;
+    }
+
+    const emojis = node.querySelectorAll('.custom-emoji');
+
+    for (var i = 0; i < emojis.length; i++) {
+      let emoji = emojis[i];
+
+      if (emoji.classList.contains('status-emoji')) {
+        continue;
+      }
+
+      emoji.classList.add('status-emoji');
+
+      emoji.addEventListener('mouseenter', this.handleEmojiMouseEnter, false);
+      emoji.addEventListener('mouseleave', this.handleEmojiMouseLeave, false);
+    }
+  }
+
+  _updateLinks () {
+    const node = this.node;
+
+    if (!node) {
+      return;
+    }
+
+    const links = node.querySelectorAll('a');
+
+    for (var i = 0; i < links.length; ++i) {
+      let link = links[i];
+
+      if (link.classList.contains('status-link')) {
+        continue;
+      }
+
+      link.classList.add('status-link');
+
+      let mention = this.props.announcement.get('mentions').find(item => link.href === item.get('url'));
+
+      if (mention) {
+        link.addEventListener('click', this.onMentionClick.bind(this, mention), false);
+        link.setAttribute('title', mention.get('acct'));
+      } else if (link.textContent[0] === '#' || (link.previousSibling && link.previousSibling.textContent && link.previousSibling.textContent[link.previousSibling.textContent.length - 1] === '#')) {
+        link.addEventListener('click', this.onHashtagClick.bind(this, link.text), false);
+      } else {
+        link.setAttribute('title', link.href);
+        link.classList.add('unhandled-link');
+      }
+
+      link.setAttribute('target', '_blank');
+      link.setAttribute('rel', 'noopener noreferrer');
+    }
+  }
+
+  onMentionClick = (mention, e) => {
+    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
+      e.preventDefault();
+      this.context.router.history.push(`/accounts/${mention.get('id')}`);
+    }
+  }
+
+  onHashtagClick = (hashtag, e) => {
+    hashtag = hashtag.replace(/^#/, '');
+
+    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
+      e.preventDefault();
+      this.context.router.history.push(`/timelines/tag/${hashtag}`);
+    }
+  }
+
+  handleEmojiMouseEnter = ({ target }) => {
+    target.src = target.getAttribute('data-original');
+  }
+
+  handleEmojiMouseLeave = ({ target }) => {
+    target.src = target.getAttribute('data-static');
+  }
+
+  render () {
+    const { announcement } = this.props;
+
+    return (
+      <div
+        className='announcements__item__content'
+        ref={this.setRef}
+        dangerouslySetInnerHTML={{ __html: announcement.get('contentHtml') }}
+      />
+    );
+  }
+
+}
+
+const assetHost = process.env.CDN_HOST || '';
+
+class Emoji extends React.PureComponent {
+
+  static propTypes = {
+    emoji: PropTypes.string.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+    hovered: PropTypes.bool.isRequired,
+  };
+
+  render () {
+    const { emoji, emojiMap, hovered } = this.props;
+
+    if (unicodeMapping[emoji]) {
+      const { filename, shortCode } = unicodeMapping[this.props.emoji];
+      const title = shortCode ? `:${shortCode}:` : '';
+
+      return (
+        <img
+          draggable='false'
+          className='emojione'
+          alt={emoji}
+          title={title}
+          src={`${assetHost}/emoji/${filename}.svg`}
+        />
+      );
+    } else if (emojiMap.get(emoji)) {
+      const filename  = (autoPlayGif || hovered) ? emojiMap.getIn([emoji, 'url']) : emojiMap.getIn([emoji, 'static_url']);
+      const shortCode = `:${emoji}:`;
+
+      return (
+        <img
+          draggable='false'
+          className='emojione custom-emoji'
+          alt={shortCode}
+          title={shortCode}
+          src={filename}
+        />
+      );
+    } else {
+      return null;
+    }
+  }
+
+}
+
+class Reaction extends ImmutablePureComponent {
+
+  static propTypes = {
+    announcementId: PropTypes.string.isRequired,
+    reaction: ImmutablePropTypes.map.isRequired,
+    addReaction: PropTypes.func.isRequired,
+    removeReaction: PropTypes.func.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+  };
+
+  state = {
+    hovered: false,
+  };
+
+  handleClick = () => {
+    const { reaction, announcementId, addReaction, removeReaction } = this.props;
+
+    if (reaction.get('me')) {
+      removeReaction(announcementId, reaction.get('name'));
+    } else {
+      addReaction(announcementId, reaction.get('name'));
+    }
+  }
+
+  handleMouseEnter = () => this.setState({ hovered: true })
+
+  handleMouseLeave = () => this.setState({ hovered: false })
+
+  render () {
+    const { reaction } = this.props;
+
+    let shortCode = reaction.get('name');
+
+    if (unicodeMapping[shortCode]) {
+      shortCode = unicodeMapping[shortCode].shortCode;
+    }
+
+    return (
+      <button className={classNames('reactions-bar__item', { active: reaction.get('me') })} onClick={this.handleClick} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} title={`:${shortCode}:`}>
+        <span className='reactions-bar__item__emoji'><Emoji hovered={this.state.hovered} emoji={reaction.get('name')} emojiMap={this.props.emojiMap} /></span>
+        <span className='reactions-bar__item__count'><FormattedNumber value={reaction.get('count')} /></span>
+      </button>
+    );
+  }
+
+}
+
+class ReactionsBar extends ImmutablePureComponent {
+
+  static propTypes = {
+    announcementId: PropTypes.string.isRequired,
+    reactions: ImmutablePropTypes.list.isRequired,
+    addReaction: PropTypes.func.isRequired,
+    removeReaction: PropTypes.func.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+  };
+
+  handleEmojiPick = data => {
+    const { addReaction, announcementId } = this.props;
+    addReaction(announcementId, data.native.replace(/:/g, ''));
+  }
+
+  render () {
+    const { reactions } = this.props;
+    const visibleReactions = reactions.filter(x => x.get('count') > 0);
+
+    return (
+      <div className={classNames('reactions-bar', { 'reactions-bar--empty': visibleReactions.isEmpty() })}>
+        {visibleReactions.map(reaction => (
+          <Reaction
+            key={reaction.get('name')}
+            reaction={reaction}
+            announcementId={this.props.announcementId}
+            addReaction={this.props.addReaction}
+            removeReaction={this.props.removeReaction}
+            emojiMap={this.props.emojiMap}
+          />
+        ))}
+
+        <EmojiPickerDropdown onPickEmoji={this.handleEmojiPick} button={<Icon id='plus' />} />
+      </div>
+    );
+  }
+
+}
+
+class Announcement extends ImmutablePureComponent {
+
+  static propTypes = {
+    announcement: ImmutablePropTypes.map.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+    dismissAnnouncement: PropTypes.func.isRequired,
+    addReaction: PropTypes.func.isRequired,
+    removeReaction: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+  };
+
+  handleDismissClick = () => {
+    const { dismissAnnouncement, announcement } = this.props;
+    dismissAnnouncement(announcement.get('id'));
+  }
+
+  render () {
+    const { announcement, intl } = this.props;
+    const startsAt = announcement.get('starts_at') && new Date(announcement.get('starts_at'));
+    const endsAt = announcement.get('ends_at') && new Date(announcement.get('ends_at'));
+    const now = new Date();
+    const hasTimeRange = startsAt && endsAt;
+    const skipYear = hasTimeRange && startsAt.getFullYear() === endsAt.getFullYear() && endsAt.getFullYear() === now.getFullYear();
+    const skipEndDate = hasTimeRange && startsAt.getDate() === endsAt.getDate() && startsAt.getMonth() === endsAt.getMonth() && startsAt.getFullYear() === endsAt.getFullYear();
+    const skipTime = announcement.get('all_day');
+
+    return (
+      <div className='announcements__item'>
+        <strong className='announcements__item__range'>
+          <FormattedMessage id='announcement.announcement' defaultMessage='Announcement' />
+          {hasTimeRange && <span> · <FormattedDate value={startsAt} hour12={false} year={(skipYear || startsAt.getFullYear() === now.getFullYear()) ? undefined : 'numeric'} month='short' day='2-digit' hour={skipTime ? undefined : '2-digit'} minute={skipTime ? undefined : '2-digit'} /> - <FormattedDate value={endsAt} hour12={false} year={(skipYear || endsAt.getFullYear() === now.getFullYear()) ? undefined : 'numeric'} month={skipEndDate ? undefined : 'short'} day={skipEndDate ? undefined : '2-digit'} hour={skipTime ? undefined : '2-digit'} minute={skipTime ? undefined : '2-digit'} /></span>}
+        </strong>
+
+        <Content announcement={announcement} />
+
+        <ReactionsBar
+          reactions={announcement.get('reactions')}
+          announcementId={announcement.get('id')}
+          addReaction={this.props.addReaction}
+          removeReaction={this.props.removeReaction}
+          emojiMap={this.props.emojiMap}
+        />
+
+        <IconButton title={intl.formatMessage(messages.close)} icon='times' className='announcements__item__dismiss-icon' onClick={this.handleDismissClick} />
+      </div>
+    );
+  }
+
+}
+
+export default @injectIntl
+class Announcements extends ImmutablePureComponent {
+
+  static propTypes = {
+    announcements: ImmutablePropTypes.list,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+    fetchAnnouncements: PropTypes.func.isRequired,
+    dismissAnnouncement: PropTypes.func.isRequired,
+    addReaction: PropTypes.func.isRequired,
+    removeReaction: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+  };
+
+  state = {
+    index: 0,
+  };
+
+  componentDidMount () {
+    const { fetchAnnouncements } = this.props;
+    fetchAnnouncements();
+  }
+
+  handleChangeIndex = index => {
+    this.setState({ index: index % this.props.announcements.size });
+  }
+
+  handleNextClick = () => {
+    this.setState({ index: (this.state.index + 1) % this.props.announcements.size });
+  }
+
+  handlePrevClick = () => {
+    this.setState({ index: (this.props.announcements.size + this.state.index - 1) % this.props.announcements.size });
+  }
+
+  render () {
+    const { announcements, intl } = this.props;
+    const { index } = this.state;
+
+    if (announcements.isEmpty()) {
+      return null;
+    }
+
+    return (
+      <div className='announcements'>
+        <img className='announcements__mastodon' alt='' draggable='false' src={mascot || elephantUIPlane} />
+
+        <div className='announcements__container'>
+          <ReactSwipeableViews index={index} onChangeIndex={this.handleChangeIndex}>
+            {announcements.map(announcement => (
+              <Announcement
+                key={announcement.get('id')}
+                announcement={announcement}
+                emojiMap={this.props.emojiMap}
+                dismissAnnouncement={this.props.dismissAnnouncement}
+                addReaction={this.props.addReaction}
+                removeReaction={this.props.removeReaction}
+                intl={intl}
+              />
+            ))}
+          </ReactSwipeableViews>
+
+          <div className='announcements__pagination'>
+            <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.previous)} icon='chevron-left' onClick={this.handlePrevClick} size={13} />
+            <span>{index + 1} / {announcements.size}</span>
+            <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.next)} icon='chevron-right' onClick={this.handleNextClick} size={13} />
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/features/getting_started/containers/announcements_container.js b/app/javascript/mastodon/features/getting_started/containers/announcements_container.js
new file mode 100644
index 000000000..b10d1d4ce
--- /dev/null
+++ b/app/javascript/mastodon/features/getting_started/containers/announcements_container.js
@@ -0,0 +1,21 @@
+import { connect } from 'react-redux';
+import { fetchAnnouncements, dismissAnnouncement, addReaction, removeReaction } from 'mastodon/actions/announcements';
+import Announcements from '../components/announcements';
+import { createSelector } from 'reselect';
+import { Map as ImmutableMap } from 'immutable';
+
+const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
+
+const mapStateToProps = state => ({
+  announcements: state.getIn(['announcements', 'items']),
+  emojiMap: customEmojiMap(state),
+});
+
+const mapDispatchToProps = dispatch => ({
+  fetchAnnouncements: () => dispatch(fetchAnnouncements()),
+  dismissAnnouncement: id => dispatch(dismissAnnouncement(id)),
+  addReaction: (id, name) => dispatch(addReaction(id, name)),
+  removeReaction: (id, name) => dispatch(removeReaction(id, name)),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(Announcements);
diff --git a/app/javascript/mastodon/features/getting_started/containers/trends_container.js b/app/javascript/mastodon/features/getting_started/containers/trends_container.js
index 1df3fb4fe..7a5268780 100644
--- a/app/javascript/mastodon/features/getting_started/containers/trends_container.js
+++ b/app/javascript/mastodon/features/getting_started/containers/trends_container.js
@@ -1,5 +1,5 @@
 import { connect } from 'react-redux';
-import { fetchTrends } from '../../../actions/trends';
+import { fetchTrends } from 'mastodon/actions/trends';
 import Trends from '../components/trends';
 
 const mapStateToProps = state => ({
diff --git a/app/javascript/mastodon/features/home_timeline/index.js b/app/javascript/mastodon/features/home_timeline/index.js
index 1cafb88ed..b7f9d5095 100644
--- a/app/javascript/mastodon/features/home_timeline/index.js
+++ b/app/javascript/mastodon/features/home_timeline/index.js
@@ -9,6 +9,7 @@ import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ColumnSettingsContainer from './containers/column_settings_container';
 import { Link } from 'react-router-dom';
+import AnnouncementsContainer from 'mastodon/features/getting_started/containers/announcements_container';
 
 const messages = defineMessages({
   title: { id: 'column.home', defaultMessage: 'Home' },
@@ -113,6 +114,8 @@ class HomeTimeline extends React.PureComponent {
         </ColumnHeader>
 
         <StatusListContainer
+          prepend={<AnnouncementsContainer />}
+          alwaysPrepend
           trackScroll={!pinned}
           scrollKey={`home_timeline-${columnId}`}
           onLoadMore={this.handleLoadMore}
diff --git a/app/javascript/mastodon/features/ui/components/media_modal.js b/app/javascript/mastodon/features/ui/components/media_modal.js
index a785551c0..d7f97f210 100644
--- a/app/javascript/mastodon/features/ui/components/media_modal.js
+++ b/app/javascript/mastodon/features/ui/components/media_modal.js
@@ -211,7 +211,6 @@ class MediaModal extends ImmutablePureComponent {
             style={swipeableViewsStyle}
             containerStyle={containerStyle}
             onChangeIndex={this.handleSwipe}
-            onSwitching={this.handleSwitching}
             index={index}
           >
             {content}
diff --git a/app/javascript/mastodon/reducers/announcements.js b/app/javascript/mastodon/reducers/announcements.js
new file mode 100644
index 000000000..aa674e516
--- /dev/null
+++ b/app/javascript/mastodon/reducers/announcements.js
@@ -0,0 +1,72 @@
+import {
+  ANNOUNCEMENTS_FETCH_REQUEST,
+  ANNOUNCEMENTS_FETCH_SUCCESS,
+  ANNOUNCEMENTS_FETCH_FAIL,
+  ANNOUNCEMENTS_UPDATE,
+  ANNOUNCEMENTS_DISMISS,
+  ANNOUNCEMENTS_REACTION_UPDATE,
+  ANNOUNCEMENTS_REACTION_ADD_REQUEST,
+  ANNOUNCEMENTS_REACTION_ADD_FAIL,
+  ANNOUNCEMENTS_REACTION_REMOVE_REQUEST,
+  ANNOUNCEMENTS_REACTION_REMOVE_FAIL,
+} from '../actions/announcements';
+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
+
+const initialState = ImmutableMap({
+  items: ImmutableList(),
+  isLoading: false,
+});
+
+const updateReaction = (state, id, name, updater) => state.update('items', list => list.map(announcement => {
+  if (announcement.get('id') === id) {
+    return announcement.update('reactions', reactions => {
+      if (reactions.find(reaction => reaction.get('name') === name)) {
+        return reactions.map(reaction => {
+          if (reaction.get('name') === name) {
+            return updater(reaction);
+          }
+
+          return reaction;
+        });
+      }
+
+      return reactions.push(updater(fromJS({ name, count: 0 })));
+    });
+  }
+
+  return announcement;
+}));
+
+const updateReactionCount = (state, reaction) => updateReaction(state, reaction.announcement_id, reaction.name, x => x.set('count', reaction.count));
+
+const addReaction = (state, id, name) => updateReaction(state, id, name, x => x.set('me', true).update('count', y => y + 1));
+
+const removeReaction = (state, id, name) => updateReaction(state, id, name, x => x.set('me', false).update('count', y => y - 1));
+
+export default function announcementsReducer(state = initialState, action) {
+  switch(action.type) {
+  case ANNOUNCEMENTS_FETCH_REQUEST:
+    return state.set('isLoading', true);
+  case ANNOUNCEMENTS_FETCH_SUCCESS:
+    return state.withMutations(map => {
+      map.set('items', fromJS(action.announcements));
+      map.set('isLoading', false);
+    });
+  case ANNOUNCEMENTS_FETCH_FAIL:
+    return state.set('isLoading', false);
+  case ANNOUNCEMENTS_UPDATE:
+    return state.update('items', list => list.unshift(fromJS(action.announcement)).sortBy(announcement => announcement.get('starts_at')));
+  case ANNOUNCEMENTS_DISMISS:
+    return state.update('items', list => list.filterNot(announcement => announcement.get('id') === action.id));
+  case ANNOUNCEMENTS_REACTION_UPDATE:
+    return updateReactionCount(state, action.reaction);
+  case ANNOUNCEMENTS_REACTION_ADD_REQUEST:
+  case ANNOUNCEMENTS_REACTION_REMOVE_FAIL:
+    return addReaction(state, action.id, action.name);
+  case ANNOUNCEMENTS_REACTION_REMOVE_REQUEST:
+  case ANNOUNCEMENTS_REACTION_ADD_FAIL:
+    return removeReaction(state, action.id, action.name);
+  default:
+    return state;
+  }
+};
diff --git a/app/javascript/mastodon/reducers/index.js b/app/javascript/mastodon/reducers/index.js
index b8d608888..b9817cd38 100644
--- a/app/javascript/mastodon/reducers/index.js
+++ b/app/javascript/mastodon/reducers/index.js
@@ -34,8 +34,10 @@ import polls from './polls';
 import identity_proofs from './identity_proofs';
 import trends from './trends';
 import missed_updates from './missed_updates';
+import announcements from './announcements';
 
 const reducers = {
+  announcements,
   dropdown_menu,
   timelines,
   meta,
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 94671c350..922d48ad7 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -859,6 +859,44 @@
   }
 }
 
+.announcements__item__content {
+  word-wrap: break-word;
+
+  .emojione {
+    width: 20px;
+    height: 20px;
+    margin: -3px 0 0;
+  }
+
+  p {
+    margin-bottom: 10px;
+    white-space: pre-wrap;
+
+    &:last-child {
+      margin-bottom: 0;
+    }
+  }
+
+  a {
+    color: $highlight-text-color;
+    text-decoration: none;
+
+    &:hover {
+      text-decoration: underline;
+    }
+
+    &.mention {
+      &:hover {
+        text-decoration: none;
+
+        span {
+          text-decoration: underline;
+        }
+      }
+    }
+  }
+}
+
 .status__content.status__content--collapsed {
   max-height: 20px * 15; // 15 lines is roughly above 500 characters
 }
@@ -6581,3 +6619,178 @@ noscript {
     }
   }
 }
+
+.announcements {
+  background: lighten($ui-base-color, 4%);
+  border-top: 1px solid $ui-base-color;
+  font-size: 13px;
+  display: flex;
+  align-items: flex-end;
+
+  &__mastodon {
+    width: 124px;
+    flex: 0 0 auto;
+
+    @media screen and (max-width: 124px + 300px) {
+      display: none;
+    }
+  }
+
+  &__container {
+    width: calc(100% - 124px);
+    flex: 0 0 auto;
+    position: relative;
+
+    @media screen and (max-width: 124px + 300px) {
+      width: 100%;
+    }
+  }
+
+  &__item {
+    box-sizing: border-box;
+    width: 100%;
+    padding: 15px;
+    padding-right: 15px + 18px;
+    position: relative;
+
+    &__range {
+      display: block;
+      font-weight: 500;
+      margin-bottom: 10px;
+    }
+
+    &__dismiss-icon {
+      position: absolute;
+      top: 12px;
+      right: 12px;
+    }
+  }
+
+  &__pagination {
+    padding: 15px;
+    color: $darker-text-color;
+    position: absolute;
+    bottom: 3px;
+    right: 0;
+  }
+}
+
+.layout-multiple-columns .announcements__mastodon {
+  display: none;
+}
+
+.layout-multiple-columns .announcements__container {
+  width: 100%;
+}
+
+.reactions-bar {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  margin-top: 15px;
+  margin-left: -2px;
+  width: calc(100% - (90px - 33px));
+
+  &__item {
+    flex-shrink: 0;
+    background: lighten($ui-base-color, 12%);
+    border: 0;
+    border-radius: 3px;
+    margin: 2px;
+    cursor: pointer;
+    user-select: none;
+    padding: 0 6px;
+    display: flex;
+    align-items: center;
+    transition: all 100ms ease-in;
+    transition-property: background-color, color;
+
+    &__emoji {
+      display: block;
+      margin: 3px 0;
+      width: 16px;
+      height: 16px;
+
+      img {
+        display: block;
+        margin: 0;
+        width: 100%;
+        height: 100%;
+        min-width: auto;
+        min-height: auto;
+        vertical-align: bottom;
+        object-fit: contain;
+      }
+    }
+
+    &__count {
+      display: block;
+      min-width: 9px;
+      font-size: 13px;
+      font-weight: 500;
+      text-align: center;
+      margin-left: 6px;
+      color: $darker-text-color;
+    }
+
+    &:hover,
+    &:focus,
+    &:active {
+      background: lighten($ui-base-color, 16%);
+      transition: all 200ms ease-out;
+      transition-property: background-color, color;
+
+      &__count {
+        color: lighten($darker-text-color, 4%);
+      }
+    }
+
+    &.active {
+      transition: all 100ms ease-in;
+      transition-property: background-color, color;
+      background-color: mix(lighten($ui-base-color, 12%), $ui-highlight-color, 90%);
+
+      .reactions-bar__item__count {
+        color: $highlight-text-color;
+      }
+    }
+  }
+
+  .emoji-picker-dropdown {
+    margin: 2px;
+  }
+
+  &:hover .emoji-button {
+    opacity: 0.85;
+  }
+
+  .emoji-button {
+    color: $darker-text-color;
+    margin: 0;
+    font-size: 16px;
+    width: auto;
+    flex-shrink: 0;
+    padding: 0 6px;
+    height: 22px;
+    display: flex;
+    align-items: center;
+    opacity: 0.5;
+    transition: all 100ms ease-in;
+    transition-property: background-color, color;
+
+    &:hover,
+    &:active,
+    &:focus {
+      opacity: 1;
+      color: lighten($darker-text-color, 4%);
+      transition: all 200ms ease-out;
+      transition-property: background-color, color;
+    }
+  }
+
+  &--empty {
+    .emoji-button {
+      padding: 0;
+    }
+  }
+}
diff --git a/app/javascript/styles/mastodon/forms.scss b/app/javascript/styles/mastodon/forms.scss
index 8965ce675..65cefbd7c 100644
--- a/app/javascript/styles/mastodon/forms.scss
+++ b/app/javascript/styles/mastodon/forms.scss
@@ -222,6 +222,12 @@ code {
     }
   }
 
+  .input.datetime .label_input select {
+    display: inline-block;
+    width: auto;
+    flex: 0;
+  }
+
   .required abbr {
     text-decoration: none;
     color: lighten($error-value-color, 12%);
diff --git a/app/lib/entity_cache.rb b/app/lib/entity_cache.rb
index 8fff544a0..35a3773d2 100644
--- a/app/lib/entity_cache.rb
+++ b/app/lib/entity_cache.rb
@@ -8,7 +8,7 @@ class EntityCache
   MAX_EXPIRATION = 7.days.freeze
 
   def mention(username, domain)
-    Rails.cache.fetch(to_key(:mention, username, domain), expires_in: MAX_EXPIRATION) { Account.select(:username, :domain, :url).find_remote(username, domain) }
+    Rails.cache.fetch(to_key(:mention, username, domain), expires_in: MAX_EXPIRATION) { Account.select(:id, :username, :domain, :url).find_remote(username, domain) }
   end
 
   def emoji(shortcodes, domain)
diff --git a/app/lib/inline_renderer.rb b/app/lib/inline_renderer.rb
index 761a8822d..27e334a4d 100644
--- a/app/lib/inline_renderer.rb
+++ b/app/lib/inline_renderer.rb
@@ -15,6 +15,10 @@ class InlineRenderer
       serializer = REST::NotificationSerializer
     when :conversation
       serializer = REST::ConversationSerializer
+    when :announcement
+      serializer = REST::AnnouncementSerializer
+    when :reaction
+      serializer = REST::ReactionSerializer
     else
       return
     end
diff --git a/app/models/account.rb b/app/models/account.rb
index 1e8abe6ec..da6f51a9c 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -476,6 +476,12 @@ class Account < ApplicationRecord
       records
     end
 
+    def from_text(text)
+      return [] if text.blank?
+
+      text.scan(MENTION_RE).map { |match| match.first.split('@', 2) }.uniq.map { |(username, domain)| EntityCache.instance.mention(username, domain) }
+    end
+
     private
 
     def generate_query_for_search(terms)
diff --git a/app/models/announcement.rb b/app/models/announcement.rb
new file mode 100644
index 000000000..4da9f94d6
--- /dev/null
+++ b/app/models/announcement.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: announcements
+#
+#  id           :bigint(8)        not null, primary key
+#  text         :text             default(""), not null
+#  published    :boolean          default(FALSE), not null
+#  all_day      :boolean          default(FALSE), not null
+#  scheduled_at :datetime
+#  starts_at    :datetime
+#  ends_at      :datetime
+#  created_at   :datetime         not null
+#  updated_at   :datetime         not null
+#
+
+class Announcement < ApplicationRecord
+  after_commit :queue_publish, on: :create
+
+  scope :unpublished, -> { where(published: false) }
+  scope :published, -> { where(published: true) }
+  scope :without_muted, ->(account) { joins("LEFT OUTER JOIN announcement_mutes ON announcement_mutes.announcement_id = announcements.id AND announcement_mutes.account_id = #{account.id}").where('announcement_mutes.id IS NULL') }
+  scope :chronological, -> { order(Arel.sql('COALESCE(announcements.starts_at, announcements.scheduled_at, announcements.created_at) ASC')) }
+
+  has_many :announcement_mutes, dependent: :destroy
+  has_many :announcement_reactions, dependent: :destroy
+
+  validates :text, presence: true
+  validates :starts_at, presence: true, if: -> { ends_at.present? }
+  validates :ends_at, presence: true, if: -> { starts_at.present? }
+
+  before_validation :set_all_day
+  before_validation :set_starts_at, on: :create
+  before_validation :set_ends_at, on: :create
+
+  def time_range?
+    starts_at.present? && ends_at.present?
+  end
+
+  def mentions
+    @mentions ||= Account.from_text(text)
+  end
+
+  def tags
+    @tags ||= Tag.find_or_create_by_names(Extractor.extract_hashtags(text))
+  end
+
+  def emojis
+    @emojis ||= CustomEmoji.from_text(text)
+  end
+
+  def reactions(account = nil)
+    records = begin
+      scope = announcement_reactions.group(:announcement_id, :name, :custom_emoji_id).order(Arel.sql('MIN(created_at) ASC'))
+
+      if account.nil?
+        scope.select('name, custom_emoji_id, count(*) as count, false as me')
+      else
+        scope.select("name, custom_emoji_id, count(*) as count, exists(select 1 from announcement_reactions r where r.account_id = #{account.id} and r.announcement_id = announcement_reactions.announcement_id and r.name = announcement_reactions.name) as me")
+      end
+    end
+
+    ActiveRecord::Associations::Preloader.new.preload(records, :custom_emoji)
+    records
+  end
+
+  private
+
+  def set_all_day
+    self.all_day = false if starts_at.blank? || ends_at.blank?
+  end
+
+  def set_starts_at
+    self.starts_at = starts_at.change(hour: 0, min: 0, sec: 0) if all_day? && starts_at.present?
+  end
+
+  def set_ends_at
+    self.ends_at = ends_at.change(hour: 23, min: 59, sec: 59) if all_day? && ends_at.present?
+  end
+
+  def queue_publish
+    PublishScheduledAnnouncementWorker.perform_async(id) if scheduled_at.blank?
+  end
+end
diff --git a/app/models/announcement_filter.rb b/app/models/announcement_filter.rb
new file mode 100644
index 000000000..950852460
--- /dev/null
+++ b/app/models/announcement_filter.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class AnnouncementFilter
+  KEYS = %i(
+    published
+    unpublished
+  ).freeze
+
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+  end
+
+  def results
+    scope = Announcement.unscoped
+
+    params.each do |key, value|
+      next if key.to_s == 'page'
+
+      scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
+    end
+
+    scope.chronological
+  end
+
+  private
+
+  def scope_for(key, _value)
+    case key.to_s
+    when 'published'
+      Announcement.published
+    when 'unpublished'
+      Announcement.unpublished
+    else
+      raise "Unknown filter: #{key}"
+    end
+  end
+end
diff --git a/app/models/announcement_mute.rb b/app/models/announcement_mute.rb
new file mode 100644
index 000000000..46fda2f5d
--- /dev/null
+++ b/app/models/announcement_mute.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: announcement_mutes
+#
+#  id              :bigint(8)        not null, primary key
+#  account_id      :bigint(8)
+#  announcement_id :bigint(8)
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+
+class AnnouncementMute < ApplicationRecord
+  belongs_to :account
+  belongs_to :announcement, inverse_of: :announcement_mutes
+
+  validates :account_id, uniqueness: { scope: :announcement_id }
+end
diff --git a/app/models/announcement_reaction.rb b/app/models/announcement_reaction.rb
new file mode 100644
index 000000000..d22771034
--- /dev/null
+++ b/app/models/announcement_reaction.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: announcement_reactions
+#
+#  id              :bigint(8)        not null, primary key
+#  account_id      :bigint(8)
+#  announcement_id :bigint(8)
+#  name            :string           default(""), not null
+#  custom_emoji_id :bigint(8)
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+
+class AnnouncementReaction < ApplicationRecord
+  after_commit :queue_publish
+
+  belongs_to :account
+  belongs_to :announcement, inverse_of: :announcement_reactions
+  belongs_to :custom_emoji, optional: true
+
+  validates :name, presence: true
+  validates_with ReactionValidator
+
+  before_validation :set_custom_emoji
+
+  private
+
+  def set_custom_emoji
+    self.custom_emoji = CustomEmoji.local.find_by(disabled: false, shortcode: name) if name.present?
+  end
+
+  def queue_publish
+    PublishAnnouncementReactionWorker.perform_async(announcement_id, name) unless announcement.destroyed?
+  end
+end
diff --git a/app/models/backup.rb b/app/models/backup.rb
index 8eeb1748a..d242fd62c 100644
--- a/app/models/backup.rb
+++ b/app/models/backup.rb
@@ -7,11 +7,11 @@
 #  user_id           :bigint(8)
 #  dump_file_name    :string
 #  dump_content_type :string
-#  dump_file_size    :bigint
 #  dump_updated_at   :datetime
 #  processed         :boolean          default(FALSE), not null
 #  created_at        :datetime         not null
 #  updated_at        :datetime         not null
+#  dump_file_size    :bigint(8)
 #
 
 class Backup < ApplicationRecord
diff --git a/app/models/bookmark.rb b/app/models/bookmark.rb
index 01dc48ee7..916261a17 100644
--- a/app/models/bookmark.rb
+++ b/app/models/bookmark.rb
@@ -3,11 +3,11 @@
 #
 # Table name: bookmarks
 #
-#  id         :integer          not null, primary key
+#  id         :bigint(8)        not null, primary key
+#  account_id :bigint(8)        not null
+#  status_id  :bigint(8)        not null
 #  created_at :datetime         not null
 #  updated_at :datetime         not null
-#  account_id :integer          not null
-#  status_id  :integer          not null
 #
 
 class Bookmark < ApplicationRecord
diff --git a/app/models/concerns/account_interactions.rb b/app/models/concerns/account_interactions.rb
index f27d39483..14bcf7bb1 100644
--- a/app/models/concerns/account_interactions.rb
+++ b/app/models/concerns/account_interactions.rb
@@ -84,6 +84,7 @@ module AccountInteractions
     has_many :muted_by, -> { order('mutes.id desc') }, through: :muted_by_relationships, source: :account
     has_many :conversation_mutes, dependent: :destroy
     has_many :domain_blocks, class_name: 'AccountDomainBlock', dependent: :destroy
+    has_many :announcement_mutes, dependent: :destroy
   end
 
   def follow!(other_account, reblogs: nil, uri: nil)
diff --git a/app/models/custom_emoji.rb b/app/models/custom_emoji.rb
index 0dacaf654..d177cf281 100644
--- a/app/models/custom_emoji.rb
+++ b/app/models/custom_emoji.rb
@@ -67,7 +67,7 @@ class CustomEmoji < ApplicationRecord
   end
 
   class << self
-    def from_text(text, domain)
+    def from_text(text, domain = nil)
       return [] if text.blank?
 
       shortcodes = text.scan(SCAN_RE).map(&:first).uniq
diff --git a/app/policies/announcement_policy.rb b/app/policies/announcement_policy.rb
new file mode 100644
index 000000000..0a4e4575c
--- /dev/null
+++ b/app/policies/announcement_policy.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class AnnouncementPolicy < ApplicationPolicy
+  def index?
+    staff?
+  end
+
+  def create?
+    admin?
+  end
+
+  def update?
+    admin?
+  end
+
+  def destroy?
+    admin?
+  end
+end
diff --git a/app/serializers/rest/announcement_serializer.rb b/app/serializers/rest/announcement_serializer.rb
new file mode 100644
index 000000000..924d87b34
--- /dev/null
+++ b/app/serializers/rest/announcement_serializer.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+class REST::AnnouncementSerializer < ActiveModel::Serializer
+  attributes :id, :content, :starts_at, :ends_at, :all_day
+
+  has_many :mentions
+  has_many :tags, serializer: REST::StatusSerializer::TagSerializer
+  has_many :emojis, serializer: REST::CustomEmojiSerializer
+  has_many :reactions, serializer: REST::ReactionSerializer
+
+  def id
+    object.id.to_s
+  end
+
+  def content
+    Formatter.instance.linkify(object.text)
+  end
+
+  def reactions
+    object.reactions(current_user&.account)
+  end
+
+  class AccountSerializer < ActiveModel::Serializer
+    attributes :id, :username, :url, :acct
+
+    def id
+      object.id.to_s
+    end
+
+    def url
+      ActivityPub::TagManager.instance.url_for(object)
+    end
+  end
+end
diff --git a/app/serializers/rest/reaction_serializer.rb b/app/serializers/rest/reaction_serializer.rb
new file mode 100644
index 000000000..1a5dca018
--- /dev/null
+++ b/app/serializers/rest/reaction_serializer.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class REST::ReactionSerializer < ActiveModel::Serializer
+  include RoutingHelper
+
+  attributes :name, :count
+
+  attribute :me, if: :current_user?
+  attribute :url, if: :custom_emoji?
+  attribute :static_url, if: :custom_emoji?
+
+  def count
+    object.respond_to?(:count) ? object.count : 0
+  end
+
+  def current_user?
+    !current_user.nil?
+  end
+
+  def custom_emoji?
+    object.custom_emoji.present?
+  end
+
+  def url
+    full_asset_url(object.custom_emoji.image.url)
+  end
+
+  def static_url
+    full_asset_url(object.custom_emoji.image.url(:static))
+  end
+end
diff --git a/app/validators/reaction_validator.rb b/app/validators/reaction_validator.rb
new file mode 100644
index 000000000..de0f2c94b
--- /dev/null
+++ b/app/validators/reaction_validator.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class ReactionValidator < ActiveModel::Validator
+  SUPPORTED_EMOJIS = Oj.load(File.read(Rails.root.join('app', 'javascript', 'mastodon', 'features', 'emoji', 'emoji_map.json'))).keys.freeze
+
+  def validate(reaction)
+    return if reaction.name.blank? || reaction.custom_emoji_id.present?
+
+    reaction.errors.add(:name, I18n.t('reactions.errors.unrecognized_emoji')) unless unicode_emoji?(reaction.name)
+  end
+
+  private
+
+  def unicode_emoji?(name)
+    SUPPORTED_EMOJIS.include?(name)
+  end
+end
diff --git a/app/views/admin/announcements/_announcement.html.haml b/app/views/admin/announcements/_announcement.html.haml
new file mode 100644
index 000000000..75768c7ba
--- /dev/null
+++ b/app/views/admin/announcements/_announcement.html.haml
@@ -0,0 +1,14 @@
+%tr
+  %td
+    = truncate(announcement.text)
+  %td
+    = time_range(announcement) if announcement.time_range?
+  %td
+    - if announcement.scheduled_at.present?
+      = fa_icon('clock-o') if announcement.scheduled_at > Time.now.utc
+      = l(announcement.scheduled_at)
+    - else
+      = l(announcement.created_at)
+  %td
+    = table_link_to 'pencil', t('generic.edit'), edit_admin_announcement_path(announcement) if can?(:update, announcement)
+    = table_link_to 'trash', t('generic.delete'), admin_announcement_path(announcement), method: :delete, data: { confirm: t('admin.accounts.are_you_sure') } if can?(:destroy, announcement)
diff --git a/app/views/admin/announcements/edit.html.haml b/app/views/admin/announcements/edit.html.haml
new file mode 100644
index 000000000..c5c605e93
--- /dev/null
+++ b/app/views/admin/announcements/edit.html.haml
@@ -0,0 +1,22 @@
+- content_for :page_title do
+  = t('.title')
+
+= simple_form_for @announcement, url: admin_announcement_path(@announcement) do |f|
+  = render 'shared/error_messages', object: @announcement
+
+  .fields-group
+    = f.input :starts_at, include_blank: true, wrapper: :with_block_label
+    = f.input :ends_at, include_blank: true, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :all_day, as: :boolean, wrapper: :with_label
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  - if @announcement.scheduled_at.present? && !@announcement.published?
+    .fields-group
+      = f.input :scheduled_at, include_blank: true, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('generic.save_changes'), type: :submit
diff --git a/app/views/admin/announcements/index.html.haml b/app/views/admin/announcements/index.html.haml
new file mode 100644
index 000000000..634f586fb
--- /dev/null
+++ b/app/views/admin/announcements/index.html.haml
@@ -0,0 +1,30 @@
+- content_for :page_title do
+  = t('admin.announcements.title')
+
+- content_for :heading_actions do
+  = link_to t('admin.announcements.new.title'), new_admin_announcement_path, class: 'button'
+
+.filters
+  .filter-subset
+    %strong= t('admin.relays.status')
+    %ul
+      %li= filter_link_to t('generic.all'), published: nil, unpublished: nil
+      %li= filter_link_to safe_join([t('admin.announcements.live'), "(#{number_with_delimiter(Announcement.published.count)})"], ' '), published: '1', unpublished: nil
+
+- if @announcements.empty?
+  %div.muted-hint.center-text
+    = t 'admin.announcements.empty'
+- else
+  .table-wrapper
+    %table.table
+      %thead
+        %tr
+          %th= t('simple_form.labels.announcement.text')
+          %th= t('admin.announcements.time_range')
+          %th= t('admin.announcements.published')
+          %th
+      %tbody
+        = render partial: 'announcement', collection: @announcements
+
+= paginate @announcements
+
diff --git a/app/views/admin/announcements/new.html.haml b/app/views/admin/announcements/new.html.haml
new file mode 100644
index 000000000..a5298c5f6
--- /dev/null
+++ b/app/views/admin/announcements/new.html.haml
@@ -0,0 +1,21 @@
+- content_for :page_title do
+  = t('.title')
+
+= simple_form_for @announcement, url: admin_announcements_path do |f|
+  = render 'shared/error_messages', object: @announcement
+
+  .fields-group
+    = f.input :starts_at, include_blank: true, wrapper: :with_block_label
+    = f.input :ends_at, include_blank: true, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :all_day, as: :boolean, wrapper: :with_label
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :scheduled_at, include_blank: true, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('.create'), type: :submit
diff --git a/app/workers/publish_announcement_reaction_worker.rb b/app/workers/publish_announcement_reaction_worker.rb
new file mode 100644
index 000000000..6f3b6dc5b
--- /dev/null
+++ b/app/workers/publish_announcement_reaction_worker.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class PublishAnnouncementReactionWorker
+  include Sidekiq::Worker
+  include Redisable
+
+  def perform(announcement_id, name)
+    announcement = Announcement.find(announcement_id)
+
+    reaction,  = announcement.announcement_reactions.where(name: name).group(:announcement_id, :name, :custom_emoji_id).select('name, custom_emoji_id, count(*) as count, false as me')
+    reaction ||= announcement.announcement_reactions.new(name: name)
+
+    payload = InlineRenderer.render(reaction, nil, :reaction).tap { |h| h[:announcement_id] = announcement_id }
+    payload = Oj.dump(event: :'announcement.reaction', payload: payload)
+
+    Account.joins(:user).where('users.current_sign_in_at > ?', User::ACTIVE_DURATION.ago).find_each do |account|
+      redis.publish("timeline:#{account.id}", payload) if redis.exists("subscribed:timeline:#{account.id}")
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end
diff --git a/app/workers/publish_scheduled_announcement_worker.rb b/app/workers/publish_scheduled_announcement_worker.rb
new file mode 100644
index 000000000..4b2014e34
--- /dev/null
+++ b/app/workers/publish_scheduled_announcement_worker.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class PublishScheduledAnnouncementWorker
+  include Sidekiq::Worker
+  include Redisable
+
+  def perform(announcement_id)
+    announcement = Announcement.find(announcement_id)
+    announcement.update(published: true)
+
+    payload = InlineRenderer.render(announcement, nil, :announcement)
+    payload = Oj.dump(event: :announcement, payload: payload)
+
+    Account.joins(:user).where('users.current_sign_in_at > ?', User::ACTIVE_DURATION.ago).find_each do |account|
+      redis.publish("timeline:#{account.id}", payload) if redis.exists("subscribed:timeline:#{account.id}")
+    end
+  end
+end
diff --git a/app/workers/scheduler/scheduled_statuses_scheduler.rb b/app/workers/scheduler/scheduled_statuses_scheduler.rb
index 1772a246b..4262f1d01 100644
--- a/app/workers/scheduler/scheduled_statuses_scheduler.rb
+++ b/app/workers/scheduler/scheduled_statuses_scheduler.rb
@@ -6,14 +6,38 @@ class Scheduler::ScheduledStatusesScheduler
   sidekiq_options unique: :until_executed, retry: 0
 
   def perform
+    publish_scheduled_statuses!
+    publish_scheduled_announcements!
+    unpublish_expired_announcements!
+  end
+
+  private
+
+  def publish_scheduled_statuses!
     due_statuses.find_each do |scheduled_status|
       PublishScheduledStatusWorker.perform_at(scheduled_status.scheduled_at, scheduled_status.id)
     end
   end
 
-  private
-
   def due_statuses
     ScheduledStatus.where('scheduled_at <= ?', Time.now.utc + PostStatusService::MIN_SCHEDULE_OFFSET)
   end
+
+  def publish_scheduled_announcements!
+    due_announcements.find_each do |announcement|
+      PublishScheduledAnnouncementWorker.perform_at(announcement.scheduled_at, announcement.id)
+    end
+  end
+
+  def due_announcements
+    Announcement.unpublished.where('scheduled_at IS NOT NULL AND scheduled_at <= ?', Time.now.utc + PostStatusService::MIN_SCHEDULE_OFFSET)
+  end
+
+  def unpublish_expired_announcements!
+    expired_announcements.in_batches.update_all(published: false)
+  end
+
+  def expired_announcements
+    Announcement.published.where('ends_at IS NOT NULL AND ends_at <= ?', Time.now.utc)
+  end
 end
diff --git a/config/initializers/simple_form.rb b/config/initializers/simple_form.rb
index 964526819..3dc48ef08 100644
--- a/config/initializers/simple_form.rb
+++ b/config/initializers/simple_form.rb
@@ -98,7 +98,7 @@ SimpleForm.setup do |config|
     b.use :html5
     b.use :label
     b.use :hint, wrap_with: { tag: :span, class: :hint }
-    b.use :input
+    b.use :input, wrap_with: { tag: :div, class: :label_input }
     b.use :error, wrap_with: { tag: :span, class: :error }
   end
 
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 2bd84c264..c4e846354 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -198,11 +198,13 @@ en:
         change_email_user: "%{name} changed the e-mail address of user %{target}"
         confirm_user: "%{name} confirmed e-mail address of user %{target}"
         create_account_warning: "%{name} sent a warning to %{target}"
+        create_announcement: "%{name} created new announcement %{target}"
         create_custom_emoji: "%{name} uploaded new emoji %{target}"
         create_domain_allow: "%{name} whitelisted domain %{target}"
         create_domain_block: "%{name} blocked domain %{target}"
         create_email_domain_block: "%{name} blacklisted e-mail domain %{target}"
         demote_user: "%{name} demoted user %{target}"
+        destroy_announcement: "%{name} deleted announcement %{target}"
         destroy_custom_emoji: "%{name} destroyed emoji %{target}"
         destroy_domain_allow: "%{name} removed domain %{target} from whitelist"
         destroy_domain_block: "%{name} unblocked domain %{target}"
@@ -224,10 +226,22 @@ en:
         unassigned_report: "%{name} unassigned report %{target}"
         unsilence_account: "%{name} unsilenced %{target}'s account"
         unsuspend_account: "%{name} unsuspended %{target}'s account"
+        update_announcement: "%{name} updated announcement %{target}"
         update_custom_emoji: "%{name} updated emoji %{target}"
         update_status: "%{name} updated status by %{target}"
       deleted_status: "(deleted status)"
       title: Audit log
+    announcements:
+      edit:
+        title: Edit announcement
+      empty: No announcements found.
+      live: Live
+      new:
+        create: Create announcement
+        title: New announcement
+      published: Published
+      time_range: Time range
+      title: Announcements
     custom_emojis:
       assign_category: Assign category
       by_domain: Domain
@@ -657,6 +671,9 @@ en:
     hint_html: "<strong>Tip:</strong> We won't ask you for your password again for the next hour."
     invalid_password: Invalid password
     prompt: Confirm password to continue
+  date:
+    formats:
+      default: "%b %d, %Y"
   datetime:
     distance_in_words:
       about_x_hours: "%{count}h"
@@ -758,6 +775,8 @@ en:
     all: All
     changes_saved_msg: Changes successfully saved!
     copy: Copy
+    delete: Delete
+    edit: Edit
     no_batch_actions_available: No batch actions available on this page
     order_by: Order by
     save_changes: Save changes
@@ -930,6 +949,9 @@ en:
     other: Other
     posting_defaults: Posting defaults
     public_timelines: Public timelines
+  reactions:
+    errors:
+      unrecognized_emoji: is not a recognized emoji
   relationships:
     activity: Account activity
     dormant: Dormant
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 66f518c1b..f050ec8a3 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -14,6 +14,12 @@ en:
         text_html: Optional. You can use toot syntax. You can <a href="%{path}">add warning presets</a> to save time
         type_html: Choose what to do with <strong>%{acct}</strong>
         warning_preset_id: Optional. You can still add custom text to end of the preset
+      announcement:
+        all_day: When checked, only the dates of the time range will be displayed
+        ends_at: Optional. Announcement will be automatically unpublished at this time
+        scheduled_at: Leave blank to publish the announcement immediately
+        starts_at: Optional. In case your announcement is bound to a specific time range
+        text: You can use toot syntax. Please be mindful of the space the announcement will take up on the user's screen
       defaults:
         autofollow: People who sign up through the invite will automatically follow you
         avatar: PNG, GIF or JPG. At most %{size}. Will be downscaled to %{dimensions}px
@@ -83,6 +89,12 @@ en:
           silence: Silence
           suspend: Suspend and irreversibly delete account data
         warning_preset_id: Use a warning preset
+      announcement:
+        all_day: All-day event
+        ends_at: End of event
+        scheduled_at: Schedule publication
+        starts_at: Begin of event
+        text: Announcement
       defaults:
         autofollow: Invite to follow your account
         avatar: Avatar
diff --git a/config/navigation.rb b/config/navigation.rb
index eebd4f75e..8fd296d5a 100644
--- a/config/navigation.rb
+++ b/config/navigation.rb
@@ -46,6 +46,7 @@ SimpleNavigation::Configuration.run do |navigation|
     n.item :admin, safe_join([fa_icon('cogs fw'), t('admin.title')]), admin_dashboard_url, if: proc { current_user.staff? } do |s|
       s.item :dashboard, safe_join([fa_icon('tachometer fw'), t('admin.dashboard.title')]), admin_dashboard_url
       s.item :settings, safe_join([fa_icon('cogs fw'), t('admin.settings.title')]), edit_admin_settings_url, if: -> { current_user.admin? }, highlights_on: %r{/admin/settings}
+      s.item :announcements, safe_join([fa_icon('bullhorn fw'), t('admin.announcements.title')]), admin_announcements_path, highlights_on: %r{/admin/announcements}
       s.item :custom_emojis, safe_join([fa_icon('smile-o fw'), t('admin.custom_emojis.title')]), admin_custom_emojis_url, highlights_on: %r{/admin/custom_emojis}
       s.item :relays, safe_join([fa_icon('exchange fw'), t('admin.relays.title')]), admin_relays_url, if: -> { current_user.admin? && !whitelist_mode? }, highlights_on: %r{/admin/relays}
       s.item :sidekiq, safe_join([fa_icon('diamond fw'), 'Sidekiq']), sidekiq_url, link_html: { target: 'sidekiq' }, if: -> { current_user.admin? }
diff --git a/config/routes.rb b/config/routes.rb
index f79af192d..da7bf6f88 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -173,9 +173,12 @@ Rails.application.routes.draw do
         get :edit
       end
     end
+
     resources :email_domain_blocks, only: [:index, :new, :create, :destroy]
     resources :action_logs, only: [:index]
     resources :warning_presets, except: [:new]
+    resources :announcements, except: [:show]
+
     resource :settings, only: [:edit, :update]
 
     resources :invites, only: [:index, :create, :destroy] do
@@ -317,6 +320,16 @@ Rails.application.routes.draw do
       resources :scheduled_statuses, only: [:index, :show, :update, :destroy]
       resources :preferences, only: [:index]
 
+      resources :announcements, only: [:index] do
+        scope module: :announcements do
+          resources :reactions, only: [:update, :destroy]
+        end
+
+        member do
+          post :dismiss
+        end
+      end
+
       resources :conversations, only: [:index, :destroy] do
         member do
           post :read
diff --git a/db/migrate/20191218153258_create_announcements.rb b/db/migrate/20191218153258_create_announcements.rb
new file mode 100644
index 000000000..58e143c92
--- /dev/null
+++ b/db/migrate/20191218153258_create_announcements.rb
@@ -0,0 +1,16 @@
+class CreateAnnouncements < ActiveRecord::Migration[5.2]
+  def change
+    create_table :announcements do |t|
+      t.text :text, null: false, default: ''
+
+      t.boolean :published, null: false, default: false
+      t.boolean :all_day, null: false, default: false
+
+      t.datetime :scheduled_at
+      t.datetime :starts_at
+      t.datetime :ends_at
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20200113125135_create_announcement_mutes.rb b/db/migrate/20200113125135_create_announcement_mutes.rb
new file mode 100644
index 000000000..c588e7fcd
--- /dev/null
+++ b/db/migrate/20200113125135_create_announcement_mutes.rb
@@ -0,0 +1,12 @@
+class CreateAnnouncementMutes < ActiveRecord::Migration[5.2]
+  def change
+    create_table :announcement_mutes do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade, index: false }
+      t.belongs_to :announcement, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    add_index :announcement_mutes, [:account_id, :announcement_id], unique: true
+  end
+end
diff --git a/db/migrate/20200114113335_create_announcement_reactions.rb b/db/migrate/20200114113335_create_announcement_reactions.rb
new file mode 100644
index 000000000..226c81a18
--- /dev/null
+++ b/db/migrate/20200114113335_create_announcement_reactions.rb
@@ -0,0 +1,15 @@
+class CreateAnnouncementReactions < ActiveRecord::Migration[5.2]
+  def change
+    create_table :announcement_reactions do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade, index: false }
+      t.belongs_to :announcement, foreign_key: { on_delete: :cascade }
+
+      t.string :name, null: false, default: ''
+      t.belongs_to :custom_emoji, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    add_index :announcement_reactions, [:account_id, :announcement_id, :name], unique: true, name: :index_announcement_reactions_on_account_id_and_announcement_id
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index fc2d3a511..d3a2c05b3 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -196,15 +196,49 @@ ActiveRecord::Schema.define(version: 2020_01_19_112504) do
     t.index ["target_type", "target_id"], name: "index_admin_action_logs_on_target_type_and_target_id"
   end
 
+  create_table "announcement_mutes", force: :cascade do |t|
+    t.bigint "account_id"
+    t.bigint "announcement_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["account_id", "announcement_id"], name: "index_announcement_mutes_on_account_id_and_announcement_id", unique: true
+    t.index ["account_id"], name: "index_announcement_mutes_on_account_id"
+    t.index ["announcement_id"], name: "index_announcement_mutes_on_announcement_id"
+  end
+
+  create_table "announcement_reactions", force: :cascade do |t|
+    t.bigint "account_id"
+    t.bigint "announcement_id"
+    t.string "name", default: "", null: false
+    t.bigint "custom_emoji_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["account_id", "announcement_id", "name"], name: "index_announcement_reactions_on_account_id_and_announcement_id", unique: true
+    t.index ["account_id"], name: "index_announcement_reactions_on_account_id"
+    t.index ["announcement_id"], name: "index_announcement_reactions_on_announcement_id"
+    t.index ["custom_emoji_id"], name: "index_announcement_reactions_on_custom_emoji_id"
+  end
+
+  create_table "announcements", force: :cascade do |t|
+    t.text "text", default: "", null: false
+    t.boolean "published", default: false, null: false
+    t.boolean "all_day", default: false, null: false
+    t.datetime "scheduled_at"
+    t.datetime "starts_at"
+    t.datetime "ends_at"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "backups", force: :cascade do |t|
     t.bigint "user_id"
     t.string "dump_file_name"
     t.string "dump_content_type"
-    t.bigint "dump_file_size"
     t.datetime "dump_updated_at"
     t.boolean "processed", default: false, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.bigint "dump_file_size"
   end
 
   create_table "blocks", force: :cascade do |t|
@@ -818,6 +852,11 @@ ActiveRecord::Schema.define(version: 2020_01_19_112504) do
   add_foreign_key "account_warnings", "accounts", on_delete: :nullify
   add_foreign_key "accounts", "accounts", column: "moved_to_account_id", on_delete: :nullify
   add_foreign_key "admin_action_logs", "accounts", on_delete: :cascade
+  add_foreign_key "announcement_mutes", "accounts", on_delete: :cascade
+  add_foreign_key "announcement_mutes", "announcements", on_delete: :cascade
+  add_foreign_key "announcement_reactions", "accounts", on_delete: :cascade
+  add_foreign_key "announcement_reactions", "announcements", on_delete: :cascade
+  add_foreign_key "announcement_reactions", "custom_emojis", on_delete: :cascade
   add_foreign_key "backups", "users", on_delete: :nullify
   add_foreign_key "blocks", "accounts", column: "target_account_id", name: "fk_9571bfabc1", on_delete: :cascade
   add_foreign_key "blocks", "accounts", name: "fk_4269e03e65", on_delete: :cascade
diff --git a/lib/tasks/auto_annotate_models.rake b/lib/tasks/auto_annotate_models.rake
index fb9c89aa4..a374e33ad 100644
--- a/lib/tasks/auto_annotate_models.rake
+++ b/lib/tasks/auto_annotate_models.rake
@@ -4,6 +4,7 @@ if Rails.env.development?
   task :set_annotation_options do
     Annotate.set_defaults(
       'routes'                  => 'false',
+      'models'                  => 'true',
       'position_in_routes'      => 'before',
       'position_in_class'       => 'before',
       'position_in_test'        => 'before',
diff --git a/spec/controllers/api/v1/announcements/reactions_controller_spec.rb b/spec/controllers/api/v1/announcements/reactions_controller_spec.rb
new file mode 100644
index 000000000..72620e242
--- /dev/null
+++ b/spec/controllers/api/v1/announcements/reactions_controller_spec.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Api::V1::Announcements::ReactionsController, type: :controller do
+  render_views
+
+  let(:user)   { Fabricate(:user) }
+  let(:scopes) { 'write:favourites' }
+  let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+
+  let!(:announcement) { Fabricate(:announcement) }
+
+  describe 'PUT #update' do
+    context 'without token' do
+      it 'returns http unauthorized' do
+        put :update, params: { announcement_id: announcement.id, id: '😂' }
+        expect(response).to have_http_status :unauthorized
+      end
+    end
+
+    context 'with token' do
+      before do
+        allow(controller).to receive(:doorkeeper_token) { token }
+        put :update, params: { announcement_id: announcement.id, id: '😂' }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'creates reaction' do
+        expect(announcement.announcement_reactions.find_by(name: '😂', account: user.account)).to_not be_nil
+      end
+    end
+  end
+
+  describe 'DELETE #destroy' do
+    before do
+      announcement.announcement_reactions.create!(account: user.account, name: '😂')
+    end
+
+    context 'without token' do
+      it 'returns http unauthorized' do
+        delete :destroy, params: { announcement_id: announcement.id, id: '😂' }
+        expect(response).to have_http_status :unauthorized
+      end
+    end
+
+    context 'with token' do
+      before do
+        allow(controller).to receive(:doorkeeper_token) { token }
+        delete :destroy, params: { announcement_id: announcement.id, id: '😂' }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'creates reaction' do
+        expect(announcement.announcement_reactions.find_by(name: '😂', account: user.account)).to be_nil
+      end
+    end
+  end
+end
diff --git a/spec/controllers/api/v1/announcements_controller_spec.rb b/spec/controllers/api/v1/announcements_controller_spec.rb
new file mode 100644
index 000000000..6ee46b60e
--- /dev/null
+++ b/spec/controllers/api/v1/announcements_controller_spec.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Api::V1::AnnouncementsController, type: :controller do
+  render_views
+
+  let(:user)   { Fabricate(:user) }
+  let(:scopes) { 'read' }
+  let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+
+  let!(:announcement) { Fabricate(:announcement) }
+
+  describe 'GET #index' do
+    context 'without token' do
+      it 'returns http unprocessable entity' do
+        get :index
+        expect(response).to have_http_status :unprocessable_entity
+      end
+    end
+
+    context 'with token' do
+      before do
+        allow(controller).to receive(:doorkeeper_token) { token }
+        get :index
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+    end
+  end
+
+  describe 'POST #dismiss' do
+    context 'without token' do
+      it 'returns http unauthorized' do
+        post :dismiss, params: { id: announcement.id }
+        expect(response).to have_http_status :unauthorized
+      end
+    end
+
+    context 'with token' do
+      let(:scopes) { 'write:accounts' }
+
+      before do
+        allow(controller).to receive(:doorkeeper_token) { token }
+        post :dismiss, params: { id: announcement.id }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'dismisses announcement' do
+        expect(announcement.announcement_mutes.find_by(account: user.account)).to_not be_nil
+      end
+    end
+  end
+end
diff --git a/spec/controllers/api/v1/trends_controller_spec.rb b/spec/controllers/api/v1/trends_controller_spec.rb
new file mode 100644
index 000000000..91e0d18fe
--- /dev/null
+++ b/spec/controllers/api/v1/trends_controller_spec.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Api::V1::TrendsController, type: :controller do
+  render_views
+
+  describe 'GET #index' do
+    before do
+      allow(TrendingTags).to receive(:get).and_return(Fabricate.times(10, :tag))
+      get :index
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(200)
+    end
+  end
+end
diff --git a/spec/fabricators/announcement_fabricator.rb b/spec/fabricators/announcement_fabricator.rb
new file mode 100644
index 000000000..5a3871d90
--- /dev/null
+++ b/spec/fabricators/announcement_fabricator.rb
@@ -0,0 +1,6 @@
+Fabricator(:announcement) do
+  text      { Faker::Lorem.paragraph(sentence_count: 2) }
+  published true
+  starts_at nil
+  ends_at   nil
+end
diff --git a/spec/fabricators/announcement_mute_fabricator.rb b/spec/fabricators/announcement_mute_fabricator.rb
new file mode 100644
index 000000000..c4eafe8f4
--- /dev/null
+++ b/spec/fabricators/announcement_mute_fabricator.rb
@@ -0,0 +1,4 @@
+Fabricator(:announcement_mute) do
+  account
+  announcement
+end
diff --git a/spec/fabricators/announcement_reaction_fabricator.rb b/spec/fabricators/announcement_reaction_fabricator.rb
new file mode 100644
index 000000000..f923c59c6
--- /dev/null
+++ b/spec/fabricators/announcement_reaction_fabricator.rb
@@ -0,0 +1,5 @@
+Fabricator(:announcement_reaction) do
+  account
+  announcement
+  name '🌿'
+end
diff --git a/spec/models/announcement_mute_spec.rb b/spec/models/announcement_mute_spec.rb
new file mode 100644
index 000000000..9d0e4c903
--- /dev/null
+++ b/spec/models/announcement_mute_spec.rb
@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe AnnouncementMute, type: :model do
+end
diff --git a/spec/models/announcement_reaction_spec.rb b/spec/models/announcement_reaction_spec.rb
new file mode 100644
index 000000000..f6e151584
--- /dev/null
+++ b/spec/models/announcement_reaction_spec.rb
@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe AnnouncementReaction, type: :model do
+end
diff --git a/spec/models/announcement_spec.rb b/spec/models/announcement_spec.rb
new file mode 100644
index 000000000..7f7b647a9
--- /dev/null
+++ b/spec/models/announcement_spec.rb
@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe Announcement, type: :model do
+end