Add trending statuses (#17431)

* Add trending statuses

* Fix dangling items with stale scores in localized sets

* Various fixes and improvements

- Change approve_all/reject_all to approve_accounts/reject_accounts
- Change Trends::Query methods to not mutate the original query
- Change Trends::Query#skip to offset
- Change follow recommendations to be refreshed in a transaction

* Add tests for trending statuses filtering behaviour

* Fix not applying filtering scope in controller

58 files changed, 869 insertions, 234 deletions

diff --git a/app/controllers/admin/trends/links/preview_card_providers_controller.rb b/app/controllers/admin/trends/links/preview_card_providers_controller.rb
index 2c26e03f3..40a466cd6 100644
--- a/app/controllers/admin/trends/links/preview_card_providers_controller.rb
+++ b/app/controllers/admin/trends/links/preview_card_providers_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::Links::PreviewCardProvidersController < Admin::BaseControll
     authorize :preview_card_provider, :index?
 
     @preview_card_providers = filtered_preview_card_providers.page(params[:page])
-    @form = Form::PreviewCardProviderBatch.new
+    @form = Trends::PreviewCardProviderBatch.new
   end
 
   def batch
-    @form = Form::PreviewCardProviderBatch.new(form_preview_card_provider_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::PreviewCardProviderBatch.new(trends_preview_card_provider_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,15 +20,15 @@ class Admin::Trends::Links::PreviewCardProvidersController < Admin::BaseControll
   private
 
   def filtered_preview_card_providers
-    PreviewCardProviderFilter.new(filter_params).results
+    Trends::PreviewCardProviderFilter.new(filter_params).results
   end
 
   def filter_params
-    params.slice(:page, *PreviewCardProviderFilter::KEYS).permit(:page, *PreviewCardProviderFilter::KEYS)
+    params.slice(:page, *Trends::PreviewCardProviderFilter::KEYS).permit(:page, *Trends::PreviewCardProviderFilter::KEYS)
   end
 
-  def form_preview_card_provider_batch_params
-    params.require(:form_preview_card_provider_batch).permit(:action, preview_card_provider_ids: [])
+  def trends_preview_card_provider_batch_params
+    params.require(:trends_preview_card_provider_batch).permit(:action, preview_card_provider_ids: [])
   end
 
   def action_from_button
diff --git a/app/controllers/admin/trends/links_controller.rb b/app/controllers/admin/trends/links_controller.rb
index 619b37deb..434eec5fe 100644
--- a/app/controllers/admin/trends/links_controller.rb
+++ b/app/controllers/admin/trends/links_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::LinksController < Admin::BaseController
     authorize :preview_card, :index?
 
     @preview_cards = filtered_preview_cards.page(params[:page])
-    @form          = Form::PreviewCardBatch.new
+    @form          = Trends::PreviewCardBatch.new
   end
 
   def batch
-    @form = Form::PreviewCardBatch.new(form_preview_card_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::PreviewCardBatch.new(trends_preview_card_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,26 +20,26 @@ class Admin::Trends::LinksController < Admin::BaseController
   private
 
   def filtered_preview_cards
-    PreviewCardFilter.new(filter_params.with_defaults(trending: 'all')).results
+    Trends::PreviewCardFilter.new(filter_params.with_defaults(trending: 'all')).results
   end
 
   def filter_params
-    params.slice(:page, *PreviewCardFilter::KEYS).permit(:page, *PreviewCardFilter::KEYS)
+    params.slice(:page, *Trends::PreviewCardFilter::KEYS).permit(:page, *Trends::PreviewCardFilter::KEYS)
   end
 
-  def form_preview_card_batch_params
-    params.require(:form_preview_card_batch).permit(:action, preview_card_ids: [])
+  def trends_preview_card_batch_params
+    params.require(:trends_preview_card_batch).permit(:action, preview_card_ids: [])
   end
 
   def action_from_button
     if params[:approve]
       'approve'
-    elsif params[:approve_all]
-      'approve_all'
+    elsif params[:approve_providers]
+      'approve_providers'
     elsif params[:reject]
       'reject'
-    elsif params[:reject_all]
-      'reject_all'
+    elsif params[:reject_providers]
+      'reject_providers'
     end
   end
 end
diff --git a/app/controllers/admin/trends/statuses_controller.rb b/app/controllers/admin/trends/statuses_controller.rb
new file mode 100644
index 000000000..766242738
--- /dev/null
+++ b/app/controllers/admin/trends/statuses_controller.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class Admin::Trends::StatusesController < Admin::BaseController
+  def index
+    authorize :status, :index?
+
+    @statuses = filtered_statuses.page(params[:page])
+    @form     = Trends::StatusBatch.new
+  end
+
+  def batch
+    @form = Trends::StatusBatch.new(trends_status_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form.save
+  rescue ActionController::ParameterMissing
+    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+  ensure
+    redirect_to admin_trends_statuses_path(filter_params)
+  end
+
+  private
+
+  def filtered_statuses
+    Trends::StatusFilter.new(filter_params.with_defaults(trending: 'all')).results.includes(:account, :media_attachments, :active_mentions)
+  end
+
+  def filter_params
+    params.slice(:page, *Trends::StatusFilter::KEYS).permit(:page, *Trends::StatusFilter::KEYS)
+  end
+
+  def trends_status_batch_params
+    params.require(:trends_status_batch).permit(:action, status_ids: [])
+  end
+
+  def action_from_button
+    if params[:approve]
+      'approve'
+    elsif params[:approve_accounts]
+      'approve_accounts'
+    elsif params[:reject]
+      'reject'
+    elsif params[:reject_accounts]
+      'reject_accounts'
+    end
+  end
+end
diff --git a/app/controllers/admin/trends/tags_controller.rb b/app/controllers/admin/trends/tags_controller.rb
index 91ff33d40..f4d1ec0d1 100644
--- a/app/controllers/admin/trends/tags_controller.rb
+++ b/app/controllers/admin/trends/tags_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::TagsController < Admin::BaseController
     authorize :tag, :index?
 
     @tags = filtered_tags.page(params[:page])
-    @form = Form::TagBatch.new
+    @form = Trends::TagBatch.new
   end
 
   def batch
-    @form = Form::TagBatch.new(form_tag_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::TagBatch.new(trends_tag_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,15 +20,15 @@ class Admin::Trends::TagsController < Admin::BaseController
   private
 
   def filtered_tags
-    TagFilter.new(filter_params).results
+    Trends::TagFilter.new(filter_params).results
   end
 
   def filter_params
-    params.slice(:page, *TagFilter::KEYS).permit(:page, *TagFilter::KEYS)
+    params.slice(:page, *Trends::TagFilter::KEYS).permit(:page, *Trends::TagFilter::KEYS)
   end
 
-  def form_tag_batch_params
-    params.require(:form_tag_batch).permit(:action, tag_ids: [])
+  def trends_tag_batch_params
+    params.require(:trends_tag_batch).permit(:action, tag_ids: [])
   end
 
   def action_from_button
diff --git a/app/controllers/api/v1/admin/trends/links_controller.rb b/app/controllers/api/v1/admin/trends/links_controller.rb
new file mode 100644
index 000000000..63b3d9358
--- /dev/null
+++ b/app/controllers/api/v1/admin/trends/links_controller.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::Trends::LinksController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action -> { authorize_if_got_token! :'admin:read' }
+  before_action :require_staff!
+  before_action :set_links
+
+  def index
+    render json: @links, each_serializer: REST::Trends::LinkSerializer
+  end
+
+  private
+
+  def set_links
+    @links = Trends.links.query.limit(limit_param(10))
+  end
+end
diff --git a/app/controllers/api/v1/admin/trends/statuses_controller.rb b/app/controllers/api/v1/admin/trends/statuses_controller.rb
new file mode 100644
index 000000000..86633cc74
--- /dev/null
+++ b/app/controllers/api/v1/admin/trends/statuses_controller.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::Trends::StatusesController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action -> { authorize_if_got_token! :'admin:read' }
+  before_action :require_staff!
+  before_action :set_statuses
+
+  def index
+    render json: @statuses, each_serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_statuses
+    @statuses = cache_collection(Trends.statuses.query.limit(limit_param(DEFAULT_STATUSES_LIMIT)), Status)
+  end
+end
diff --git a/app/controllers/api/v1/admin/trends/tags_controller.rb b/app/controllers/api/v1/admin/trends/tags_controller.rb
index 4815af31e..5cc4c269d 100644
--- a/app/controllers/api/v1/admin/trends/tags_controller.rb
+++ b/app/controllers/api/v1/admin/trends/tags_controller.rb
@@ -14,6 +14,6 @@ class Api::V1::Admin::Trends::TagsController < Api::BaseController
   private
 
   def set_tags
-    @tags = Trends.tags.get(false, limit_param(10))
+    @tags = Trends.tags.query.limit(limit_param(10))
   end
 end
diff --git a/app/controllers/api/v1/trends/links_controller.rb b/app/controllers/api/v1/trends/links_controller.rb
index 1c3ab1e1c..ad20e7f8b 100644
--- a/app/controllers/api/v1/trends/links_controller.rb
+++ b/app/controllers/api/v1/trends/links_controller.rb
@@ -12,10 +12,14 @@ class Api::V1::Trends::LinksController < Api::BaseController
   def set_links
     @links = begin
       if Setting.trends
-        Trends.links.get(true, limit_param(10))
+        links_from_trends
       else
         []
       end
     end
   end
+
+  def links_from_trends
+    Trends.links.query.allowed.in_locale(content_locale).limit(limit_param(10))
+  end
 end
diff --git a/app/controllers/api/v1/trends/statuses_controller.rb b/app/controllers/api/v1/trends/statuses_controller.rb
new file mode 100644
index 000000000..d4ec97ae5
--- /dev/null
+++ b/app/controllers/api/v1/trends/statuses_controller.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class Api::V1::Trends::StatusesController < Api::BaseController
+  before_action :set_statuses
+
+  def index
+    render json: @statuses, each_serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_statuses
+    @statuses = begin
+      if Setting.trends
+        cache_collection(statuses_from_trends, Status)
+      else
+        []
+      end
+    end
+  end
+
+  def statuses_from_trends
+    scope = Trends.statuses.query.allowed.in_locale(content_locale)
+    scope = scope.filtered_for(current_account) if user_signed_in?
+    scope.limit(limit_param(DEFAULT_STATUSES_LIMIT))
+  end
+end
diff --git a/app/controllers/api/v1/trends/tags_controller.rb b/app/controllers/api/v1/trends/tags_controller.rb
index 947b53de2..1334b72d2 100644
--- a/app/controllers/api/v1/trends/tags_controller.rb
+++ b/app/controllers/api/v1/trends/tags_controller.rb
@@ -12,7 +12,7 @@ class Api::V1::Trends::TagsController < Api::BaseController
   def set_tags
     @tags = begin
       if Setting.trends
-        Trends.tags.get(true, limit_param(10))
+        Trends.tags.query.allowed.limit(limit_param(10))
       else
         []
       end
diff --git a/app/controllers/concerns/localized.rb b/app/controllers/concerns/localized.rb
index 173316800..ede299d5a 100644
--- a/app/controllers/concerns/localized.rb
+++ b/app/controllers/concerns/localized.rb
@@ -27,4 +27,8 @@ module Localized
   def available_locale_or_nil(locale_name)
     locale_name.to_sym if locale_name.present? && I18n.available_locales.include?(locale_name.to_sym)
   end
+
+  def content_locale
+    @content_locale ||= I18n.locale.to_s.split(/[_-]/).first
+  end
 end
diff --git a/app/helpers/admin/filter_helper.rb b/app/helpers/admin/filter_helper.rb
index 907529b37..140fc73ed 100644
--- a/app/helpers/admin/filter_helper.rb
+++ b/app/helpers/admin/filter_helper.rb
@@ -5,9 +5,10 @@ module Admin::FilterHelper
     AccountFilter::KEYS,
     CustomEmojiFilter::KEYS,
     ReportFilter::KEYS,
-    TagFilter::KEYS,
-    PreviewCardProviderFilter::KEYS,
-    PreviewCardFilter::KEYS,
+    Trends::TagFilter::KEYS,
+    Trends::PreviewCardProviderFilter::KEYS,
+    Trends::PreviewCardFilter::KEYS,
+    Trends::StatusFilter::KEYS,
     InstanceFilter::KEYS,
     InviteFilter::KEYS,
     RelationshipFilter::KEYS,
diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index 3a65af686..f22cc6d28 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -242,6 +242,6 @@ module LanguagesHelper
   end
 
   def valid_locale?(locale)
-    SUPPORTED_LOCALES.key?(locale.to_sym)
+    locale.present? && SUPPORTED_LOCALES.key?(locale.to_sym)
   end
 end
diff --git a/app/javascript/styles/mastodon/accounts.scss b/app/javascript/styles/mastodon/accounts.scss
index 485fe4a9d..215774a19 100644
--- a/app/javascript/styles/mastodon/accounts.scss
+++ b/app/javascript/styles/mastodon/accounts.scss
@@ -331,7 +331,8 @@
 }
 
 .batch-table__row--muted .pending-account__header,
-.batch-table__row--muted .accounts-table {
+.batch-table__row--muted .accounts-table,
+.batch-table__row--muted .name-tag {
   &,
   a,
   strong {
@@ -339,6 +340,10 @@
   }
 }
 
+.batch-table__row--muted .name-tag .avatar {
+  opacity: 0.5;
+}
+
 .batch-table__row--muted .accounts-table {
   tbody td.accounts-table__extra,
   &__count,
@@ -352,7 +357,8 @@
 }
 
 .batch-table__row--attention .pending-account__header,
-.batch-table__row--attention .accounts-table {
+.batch-table__row--attention .accounts-table,
+.batch-table__row--attention .name-tag {
   &,
   a,
   strong {
diff --git a/app/javascript/styles/mastodon/tables.scss b/app/javascript/styles/mastodon/tables.scss
index 36bc07a72..1f7e71776 100644
--- a/app/javascript/styles/mastodon/tables.scss
+++ b/app/javascript/styles/mastodon/tables.scss
@@ -210,6 +210,7 @@ a.table-action-link {
     &__content {
       padding-top: 12px;
       padding-bottom: 16px;
+      overflow: hidden;
 
       &--unpadded {
         padding: 0;
@@ -296,3 +297,9 @@ a.table-action-link {
     }
   }
 }
+
+.one-liner {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
diff --git a/app/lib/activitypub/activity/announce.rb b/app/lib/activitypub/activity/announce.rb
index 12fad8da4..7cd5a41e8 100644
--- a/app/lib/activitypub/activity/announce.rb
+++ b/app/lib/activitypub/activity/announce.rb
@@ -23,8 +23,7 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
         visibility: visibility_from_audience
       )
 
-      Trends.tags.register(@status)
-      Trends.links.register(@status)
+      Trends.register!(@status)
 
       distribute
     end
diff --git a/app/lib/activitypub/activity/like.rb b/app/lib/activitypub/activity/like.rb
index c065f01f8..ebbda15b9 100644
--- a/app/lib/activitypub/activity/like.rb
+++ b/app/lib/activitypub/activity/like.rb
@@ -7,6 +7,8 @@ class ActivityPub::Activity::Like < ActivityPub::Activity
     return if original_status.nil? || !original_status.account.local? || delete_arrived_first?(@json['id']) || @account.favourited?(original_status)
 
     favourite = original_status.favourites.create!(account: @account)
+
     NotifyService.new.call(original_status.account, :favourite, favourite)
+    Trends.statuses.register(original_status)
   end
 end
diff --git a/app/mailers/admin_mailer.rb b/app/mailers/admin_mailer.rb
index a9d00c000..f416977d8 100644
--- a/app/mailers/admin_mailer.rb
+++ b/app/mailers/admin_mailer.rb
@@ -35,25 +35,18 @@ class AdminMailer < ApplicationMailer
     end
   end
 
-  def new_trending_tags(recipient, tags)
-    @tags                = tags
-    @me                  = recipient
-    @instance            = Rails.configuration.x.local_domain
-    @lowest_trending_tag = Trends.tags.get(true, Trends.tags.options[:review_threshold]).last
+  def new_trends(recipient, links, tags, statuses)
+    @links                  = links
+    @lowest_trending_link   = Trends.links.query.allowed.limit(Trends.links.options[:review_threshold]).last
+    @tags                   = tags
+    @lowest_trending_tag    = Trends.tags.query.allowed.limit(Trends.tags.options[:review_threshold]).last
+    @statuses               = statuses
+    @lowest_trending_status = Trends.statuses.query.allowed.limit(Trends.statuses.options[:review_threshold]).last
+    @me                     = recipient
+    @instance               = Rails.configuration.x.local_domain
 
     locale_for_account(@me) do
-      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trending_tags.subject', instance: @instance)
-    end
-  end
-
-  def new_trending_links(recipient, links)
-    @links                = links
-    @me                   = recipient
-    @instance             = Rails.configuration.x.local_domain
-    @lowest_trending_link = Trends.links.get(true, Trends.links.options[:review_threshold]).last
-
-    locale_for_account(@me) do
-      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trending_links.subject', instance: @instance)
+      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trends.subject', instance: @instance)
     end
   end
 end
diff --git a/app/models/account.rb b/app/models/account.rb
index 2ad45feda..dfdf9045f 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -40,13 +40,15 @@
 #  also_known_as                 :string           is an Array
 #  silenced_at                   :datetime
 #  suspended_at                  :datetime
-#  trust_level                   :integer
 #  hide_collections              :boolean
 #  avatar_storage_schema_version :integer
 #  header_storage_schema_version :integer
 #  devices_url                   :string
 #  suspension_origin             :integer
 #  sensitized_at                 :datetime
+#  trendable                     :boolean
+#  reviewed_at                   :datetime
+#  requested_review_at           :datetime
 #
 
 class Account < ApplicationRecord
@@ -56,6 +58,7 @@ class Account < ApplicationRecord
     remote_url
     salmon_url
     hub_url
+    trust_level
   )
 
   USERNAME_RE   = /[a-z0-9_]+([a-z0-9_\.-]+[a-z0-9_]+)?/i
@@ -74,11 +77,6 @@ class Account < ApplicationRecord
   include DomainMaterializable
   include AccountMerging
 
-  TRUST_LEVELS = {
-    untrusted: 0,
-    trusted: 1,
-  }.freeze
-
   enum protocol: [:ostatus, :activitypub]
   enum suspension_origin: [:local, :remote], _prefix: true
 
@@ -202,10 +200,6 @@ class Account < ApplicationRecord
     last_webfingered_at.nil? || last_webfingered_at <= 1.day.ago
   end
 
-  def trust_level
-    self[:trust_level] || 0
-  end
-
   def refresh!
     ResolveAccountService.new.call(acct) unless local?
   end
@@ -388,6 +382,22 @@ class Account < ApplicationRecord
     @synchronization_uri_prefix ||= "#{uri[URL_PREFIX_RE]}/"
   end
 
+  def requires_review?
+    reviewed_at.nil?
+  end
+
+  def reviewed?
+    reviewed_at.present?
+  end
+
+  def requested_review?
+    requested_review_at.present?
+  end
+
+  def requires_review_notification?
+    requires_review? && !requested_review?
+  end
+
   class Field < ActiveModelSerializers::Model
     attributes :name, :value, :verified_at, :account
 
diff --git a/app/models/status.rb b/app/models/status.rb
index 96e41b1d3..adb92ef91 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -268,6 +268,18 @@ class Status < ApplicationRecord
     update_status_stat!(key => [public_send(key) - 1, 0].max)
   end
 
+  def trendable?
+    if attributes['trendable'].nil?
+      account.trendable?
+    else
+      attributes['trendable']
+    end
+  end
+
+  def requires_review_notification?
+    attributes['trendable'].nil? && account.requires_review_notification?
+  end
+
   after_create_commit  :increment_counter_caches
   after_destroy_commit :decrement_counter_caches
 
diff --git a/app/models/trends.rb b/app/models/trends.rb
index 7dd3a9c87..f8864e55f 100644
--- a/app/models/trends.rb
+++ b/app/models/trends.rb
@@ -13,15 +13,37 @@ module Trends
     @tags ||= Trends::Tags.new
   end
 
+  def self.statuses
+    @statuses ||= Trends::Statuses.new
+  end
+
+  def self.register!(status)
+    [links, tags, statuses].each { |trend_type| trend_type.register(status) }
+  end
+
   def self.refresh!
-    [links, tags].each(&:refresh)
+    [links, tags, statuses].each(&:refresh)
   end
 
   def self.request_review!
-    [links, tags].each(&:request_review) if enabled?
+    return unless enabled?
+
+    links_requiring_review    = links.request_review
+    tags_requiring_review     = tags.request_review
+    statuses_requiring_review = statuses.request_review
+
+    return if links_requiring_review.empty? && tags_requiring_review.empty? && statuses_requiring_review.empty?
+
+    User.staff.includes(:account).find_each do |user|
+      AdminMailer.new_trends(user.account, links_requiring_review, tags_requiring_review, statuses_requiring_review).deliver_later! if user.allows_trends_review_emails?
+    end
   end
 
   def self.enabled?
     Setting.trends
   end
+
+  def self.available_locales
+    @available_locales ||= I18n.available_locales.map { |locale| locale.to_s.split(/[_-]/).first }.uniq
+  end
 end
diff --git a/app/models/trends/base.rb b/app/models/trends/base.rb
index b767dcb1a..7ed13228d 100644
--- a/app/models/trends/base.rb
+++ b/app/models/trends/base.rb
@@ -2,6 +2,7 @@
 
 class Trends::Base
   include Redisable
+  include LanguagesHelper
 
   class_attribute :default_options
 
@@ -32,8 +33,8 @@ class Trends::Base
     raise NotImplementedError
   end
 
-  def get(*)
-    raise NotImplementedError
+  def query
+    Trends::Query.new(key_prefix, klass)
   end
 
   def score(id)
@@ -72,6 +73,21 @@ class Trends::Base
     redis.zrevrange("#{key_prefix}:allowed", 0, rank, with_scores: true).last&.last || 0
   end
 
+  # @param [Integer] id
+  # @param [Float] score
+  # @param [Hash<String, Boolean>] subsets
+  def add_to_and_remove_from_subsets(id, score, subsets = {})
+    subsets.each_key do |subset|
+      key = [key_prefix, subset].compact.join(':')
+
+      if score.positive? && subsets[subset]
+        redis.zadd(key, score, id)
+      else
+        redis.zrem(key, id)
+      end
+    end
+  end
+
   private
 
   def used_key(at_time)
diff --git a/app/models/trends/links.rb b/app/models/trends/links.rb
index a0d65138b..62308e706 100644
--- a/app/models/trends/links.rb
+++ b/app/models/trends/links.rb
@@ -4,8 +4,8 @@ class Trends::Links < Trends::Base
   PREFIX = 'trending_links'
 
   self.default_options = {
-    threshold: 15,
-    review_threshold: 10,
+    threshold: 5,
+    review_threshold: 3,
     max_score_cooldown: 2.days.freeze,
     max_score_halflife: 8.hours.freeze,
   }
@@ -27,12 +27,6 @@ class Trends::Links < Trends::Base
     record_used_id(preview_card.id, at_time)
   end
 
-  def get(allowed, limit)
-    preview_card_ids = currently_trending_ids(allowed, limit)
-    preview_cards = PreviewCard.where(id: preview_card_ids).index_by(&:id)
-    preview_card_ids.map { |id| preview_cards[id] }.compact
-  end
-
   def refresh(at_time = Time.now.utc)
     preview_cards = PreviewCard.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
     calculate_scores(preview_cards, at_time)
@@ -42,7 +36,7 @@ class Trends::Links < Trends::Base
   def request_review
     preview_cards = PreviewCard.where(id: currently_trending_ids(false, -1))
 
-    preview_cards_requiring_review = preview_cards.filter_map do |preview_card|
+    preview_cards.filter_map do |preview_card|
       next unless would_be_trending?(preview_card.id) && !preview_card.trendable? && preview_card.requires_review_notification?
 
       if preview_card.provider.nil?
@@ -53,12 +47,6 @@ class Trends::Links < Trends::Base
 
       preview_card
     end
-
-    return if preview_cards_requiring_review.empty?
-
-    User.staff.includes(:account).find_each do |user|
-      AdminMailer.new_trending_links(user.account, preview_cards_requiring_review).deliver_later! if user.allows_trending_tag_emails?
-    end
   end
 
   protected
@@ -67,6 +55,10 @@ class Trends::Links < Trends::Base
     PREFIX
   end
 
+  def klass
+    PreviewCard
+  end
+
   private
 
   def calculate_scores(preview_cards, at_time)
@@ -96,17 +88,27 @@ class Trends::Links < Trends::Base
 
       decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
 
-      if decaying_score.zero?
-        redis.zrem("#{PREFIX}:all", preview_card.id)
-        redis.zrem("#{PREFIX}:allowed", preview_card.id)
-      else
-        redis.zadd("#{PREFIX}:all", decaying_score, preview_card.id)
+      add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
+        all: true,
+        allowed: preview_card.trendable?,
+      })
 
-        if preview_card.trendable?
-          redis.zadd("#{PREFIX}:allowed", decaying_score, preview_card.id)
-        else
-          redis.zrem("#{PREFIX}:allowed", preview_card.id)
-        end
+      next unless valid_locale?(preview_card.language)
+
+      add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
+        "all:#{preview_card.language}" => true,
+        "allowed:#{preview_card.language}" => preview_card.trendable?,
+      })
+    end
+
+    # Clean up localized sets by calculating the intersection with the main
+    # set. We do this instead of just deleting the localized sets to avoid
+    # having moments where the API returns empty results
+
+    redis.pipelined do
+      Trends.available_locales.each do |locale|
+        redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+        redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
       end
     end
   end
diff --git a/app/models/form/preview_card_batch.rb b/app/models/trends/preview_card_batch.rb
index 5f6e6522a..b1d682910 100644
--- a/app/models/form/preview_card_batch.rb
+++ b/app/models/trends/preview_card_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::PreviewCardBatch
+class Trends::PreviewCardBatch
   include ActiveModel::Model
   include Authorization
 
@@ -10,12 +10,12 @@ class Form::PreviewCardBatch
     case action
     when 'approve'
       approve!
-    when 'approve_all'
-      approve_all!
+    when 'approve_providers'
+      approve_providers!
     when 'reject'
       reject!
-    when 'reject_all'
-      reject_all!
+    when 'reject_providers'
+      reject_providers!
     end
   end
 
@@ -30,13 +30,13 @@ class Form::PreviewCardBatch
   end
 
   def approve!
-    preview_cards.each { |preview_card| authorize(preview_card, :update?) }
+    preview_cards.each { |preview_card| authorize(preview_card, :review?) }
     preview_cards.update_all(trendable: true)
   end
 
-  def approve_all!
+  def approve_providers!
     preview_card_providers.each do |provider|
-      authorize(provider, :update?)
+      authorize(provider, :review?)
       provider.update(trendable: true, reviewed_at: action_time)
     end
 
@@ -45,13 +45,13 @@ class Form::PreviewCardBatch
   end
 
   def reject!
-    preview_cards.each { |preview_card| authorize(preview_card, :update?) }
+    preview_cards.each { |preview_card| authorize(preview_card, :review?) }
     preview_cards.update_all(trendable: false)
   end
 
-  def reject_all!
+  def reject_providers!
     preview_card_providers.each do |provider|
-      authorize(provider, :update?)
+      authorize(provider, :review?)
       provider.update(trendable: false, reviewed_at: action_time)
     end
 
diff --git a/app/models/preview_card_filter.rb b/app/models/trends/preview_card_filter.rb
index 8dda9989c..25add58c8 100644
--- a/app/models/preview_card_filter.rb
+++ b/app/models/trends/preview_card_filter.rb
@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
-class PreviewCardFilter
+class Trends::PreviewCardFilter
   KEYS = %i(
     trending
+    locale
   ).freeze
 
   attr_reader :params
@@ -15,7 +16,7 @@ class PreviewCardFilter
     scope = PreviewCard.unscoped
 
     params.each do |key, value|
-      next if key.to_s == 'page'
+      next if %w(page locale).include?(key.to_s)
 
       scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
     end
@@ -35,19 +36,11 @@ class PreviewCardFilter
   end
 
   def trending_scope(value)
-    ids = begin
-      case value.to_s
-      when 'allowed'
-        Trends.links.currently_trending_ids(true, -1)
-      else
-        Trends.links.currently_trending_ids(false, -1)
-      end
-    end
+    scope = Trends.links.query
 
-    if ids.empty?
-      PreviewCard.none
-    else
-      PreviewCard.joins("join unnest(array[#{ids.map(&:to_i).join(',')}]::integer[]) with ordinality as x (id, ordering) on preview_cards.id = x.id").order('x.ordering')
-    end
+    scope = scope.in_locale(@params[:locale].to_s) if @params[:locale].present?
+    scope = scope.allowed if value == 'allowed'
+
+    scope.to_arel
   end
 end
diff --git a/app/models/form/preview_card_provider_batch.rb b/app/models/trends/preview_card_provider_batch.rb
index e6ab3d8fa..062720c81 100644
--- a/app/models/form/preview_card_provider_batch.rb
+++ b/app/models/trends/preview_card_provider_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::PreviewCardProviderBatch
+class Trends::PreviewCardProviderBatch
   include ActiveModel::Model
   include Authorization
 
@@ -22,12 +22,12 @@ class Form::PreviewCardProviderBatch
   end
 
   def approve!
-    preview_card_providers.each { |provider| authorize(provider, :update?) }
+    preview_card_providers.each { |provider| authorize(provider, :review?) }
     preview_card_providers.update_all(trendable: true, reviewed_at: Time.now.utc)
   end
 
   def reject!
-    preview_card_providers.each { |provider| authorize(provider, :update?) }
+    preview_card_providers.each { |provider| authorize(provider, :review?) }
     preview_card_providers.update_all(trendable: false, reviewed_at: Time.now.utc)
   end
 end
diff --git a/app/models/preview_card_provider_filter.rb b/app/models/trends/preview_card_provider_filter.rb
index 1e90d3c9d..abfdd07e8 100644
--- a/app/models/preview_card_provider_filter.rb
+++ b/app/models/trends/preview_card_provider_filter.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class PreviewCardProviderFilter
+class Trends::PreviewCardProviderFilter
   KEYS = %i(
     status
   ).freeze
diff --git a/app/models/trends/query.rb b/app/models/trends/query.rb
new file mode 100644
index 000000000..64a4c0c1f
--- /dev/null
+++ b/app/models/trends/query.rb
@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+class Trends::Query
+  include Redisable
+  include Enumerable
+
+  attr_reader :prefix, :klass, :loaded
+
+  alias loaded? loaded
+
+  def initialize(prefix, klass)
+    @prefix  = prefix
+    @klass   = klass
+    @records = []
+    @loaded  = false
+    @allowed = false
+    @limit   = -1
+    @offset  = 0
+  end
+
+  def allowed!
+    @allowed = true
+    self
+  end
+
+  def allowed
+    clone.allowed!
+  end
+
+  def in_locale!(value)
+    @locale = value
+    self
+  end
+
+  def in_locale(value)
+    clone.in_locale!(value)
+  end
+
+  def offset!(value)
+    @offset = value
+    self
+  end
+
+  def offset(value)
+    clone.offset!(value)
+  end
+
+  def limit!(value)
+    @limit = value
+    self
+  end
+
+  def limit(value)
+    clone.limit!(value)
+  end
+
+  def records
+    load
+    @records
+  end
+
+  delegate :each, :empty?, :first, :last, to: :records
+
+  def to_ary
+    records.dup
+  end
+
+  alias to_a to_ary
+
+  def to_arel
+    tmp_ids = ids
+
+    if tmp_ids.empty?
+      klass.none
+    else
+      klass.joins("join unnest(array[#{tmp_ids.join(',')}]) with ordinality as x (id, ordering) on #{klass.table_name}.id = x.id").reorder('x.ordering')
+    end
+  end
+
+  private
+
+  def key
+    [@prefix, @allowed ? 'allowed' : 'all', @locale].compact.join(':')
+  end
+
+  def load
+    unless loaded?
+      @records = perform_queries
+      @loaded  = true
+    end
+
+    self
+  end
+
+  def ids
+    redis.zrevrange(key, @offset, @limit.positive? ? @limit - 1 : @limit).map(&:to_i)
+  end
+
+  def perform_queries
+    apply_scopes(to_arel).to_a
+  end
+
+  def apply_scopes(scope)
+    scope
+  end
+end
diff --git a/app/models/trends/status_batch.rb b/app/models/trends/status_batch.rb
new file mode 100644
index 000000000..78d93bed4
--- /dev/null
+++ b/app/models/trends/status_batch.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+class Trends::StatusBatch
+  include ActiveModel::Model
+  include Authorization
+
+  attr_accessor :status_ids, :action, :current_account
+
+  def save
+    case action
+    when 'approve'
+      approve!
+    when 'approve_accounts'
+      approve_accounts!
+    when 'reject'
+      reject!
+    when 'reject_accounts'
+      reject_accounts!
+    end
+  end
+
+  private
+
+  def statuses
+    @statuses ||= Status.where(id: status_ids)
+  end
+
+  def status_accounts
+    @status_accounts ||= Account.where(id: statuses.map(&:account_id).uniq)
+  end
+
+  def approve!
+    statuses.each { |status| authorize(status, :review?) }
+    statuses.update_all(trendable: true)
+  end
+
+  def approve_accounts!
+    status_accounts.each do |account|
+      authorize(account, :review?)
+      account.update(trendable: true, reviewed_at: action_time)
+    end
+
+    # Reset any individual overrides
+    statuses.update_all(trendable: nil)
+  end
+
+  def reject!
+    statuses.each { |status| authorize(status, :review?) }
+    statuses.update_all(trendable: false)
+  end
+
+  def reject_accounts!
+    status_accounts.each do |account|
+      authorize(account, :review?)
+      account.update(trendable: false, reviewed_at: action_time)
+    end
+
+    # Reset any individual overrides
+    statuses.update_all(trendable: nil)
+  end
+
+  def action_time
+    @action_time ||= Time.now.utc
+  end
+end
diff --git a/app/models/trends/status_filter.rb b/app/models/trends/status_filter.rb
new file mode 100644
index 000000000..7c453e339
--- /dev/null
+++ b/app/models/trends/status_filter.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class Trends::StatusFilter
+  KEYS = %i(
+    trending
+    locale
+  ).freeze
+
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+  end
+
+  def results
+    scope = Status.unscoped.kept
+
+    params.each do |key, value|
+      next if %w(page locale).include?(key.to_s)
+
+      scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
+    end
+
+    scope
+  end
+
+  private
+
+  def scope_for(key, value)
+    case key.to_s
+    when 'trending'
+      trending_scope(value)
+    else
+      raise "Unknown filter: #{key}"
+    end
+  end
+
+  def trending_scope(value)
+    scope = Trends.statuses.query
+
+    scope = scope.in_locale(@params[:locale].to_s) if @params[:locale].present?
+    scope = scope.allowed if value == 'allowed'
+
+    scope.to_arel
+  end
+end
diff --git a/app/models/trends/statuses.rb b/app/models/trends/statuses.rb
new file mode 100644
index 000000000..e785413ec
--- /dev/null
+++ b/app/models/trends/statuses.rb
@@ -0,0 +1,142 @@
+# frozen_string_literal: true
+
+class Trends::Statuses < Trends::Base
+  PREFIX = 'trending_statuses'
+
+  self.default_options = {
+    threshold: 5,
+    review_threshold: 3,
+    score_halflife: 2.hours.freeze,
+  }
+
+  class Query < Trends::Query
+    def filtered_for!(account)
+      @account = account
+      self
+    end
+
+    def filtered_for(account)
+      clone.filtered_for!(account)
+    end
+
+    private
+
+    def apply_scopes(scope)
+      scope.includes(:account)
+    end
+
+    def perform_queries
+      return super if @account.nil?
+
+      statuses        = super
+      account_ids     = statuses.map(&:account_id)
+      account_domains = statuses.map(&:account_domain)
+
+      preloaded_relations = {
+        blocking: Account.blocking_map(account_ids, @account.id),
+        blocked_by: Account.blocked_by_map(account_ids, @account.id),
+        muting: Account.muting_map(account_ids, @account.id),
+        following: Account.following_map(account_ids, @account.id),
+        domain_blocking_by_domain: Account.domain_blocking_map_by_domain(account_domains, @account.id),
+      }
+
+      statuses.reject { |status| StatusFilter.new(status, @account, preloaded_relations).filtered? }
+    end
+  end
+
+  def register(status, at_time = Time.now.utc)
+    add(status.proper, status.account_id, at_time) if eligible?(status)
+  end
+
+  def add(status, _account_id, at_time = Time.now.utc)
+    # We rely on the total reblogs and favourites count, so we
+    # don't record which account did the what and when here
+
+    record_used_id(status.id, at_time)
+  end
+
+  def query
+    Query.new(key_prefix, klass)
+  end
+
+  def refresh(at_time = Time.now.utc)
+    statuses = Status.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq).includes(:account, :media_attachments)
+    calculate_scores(statuses, at_time)
+    trim_older_items
+  end
+
+  def request_review
+    statuses = Status.where(id: currently_trending_ids(false, -1)).includes(:account)
+
+    statuses.filter_map do |status|
+      next unless would_be_trending?(status.id) && !status.trendable? && status.requires_review_notification?
+
+      status.account.touch(:requested_review_at)
+      status
+    end
+  end
+
+  protected
+
+  def key_prefix
+    PREFIX
+  end
+
+  def klass
+    Status
+  end
+
+  private
+
+  def eligible?(status)
+    original_status = status.proper
+
+    original_status.public_visibility? &&
+      original_status.account.discoverable? && !original_status.account.silenced? &&
+      original_status.spoiler_text.blank? && !original_status.sensitive? && !original_status.reply?
+  end
+
+  def calculate_scores(statuses, at_time)
+    redis.pipelined do
+      statuses.each do |status|
+        expected  = 1.0
+        observed  = (status.reblogs_count + status.favourites_count).to_f
+
+        score = begin
+          if expected > observed || observed < options[:threshold]
+            0
+          else
+            ((observed - expected)**2) / expected
+          end
+        end
+
+        decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
+
+        add_to_and_remove_from_subsets(status.id, decaying_score, {
+          all: true,
+          allowed: status.trendable? && status.account.discoverable?,
+        })
+
+        next unless valid_locale?(status.language)
+
+        add_to_and_remove_from_subsets(status.id, decaying_score, {
+          "all:#{status.language}" => true,
+          "allowed:#{status.language}" => status.trendable? && status.account.discoverable?,
+        })
+      end
+
+      # Clean up localized sets by calculating the intersection with the main
+      # set. We do this instead of just deleting the localized sets to avoid
+      # having moments where the API returns empty results
+
+      Trends.available_locales.each do |locale|
+        redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+        redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+      end
+    end
+  end
+
+  def would_be_trending?(id)
+    score(id) > score_at_rank(options[:review_threshold] - 1)
+  end
+end
diff --git a/app/models/form/tag_batch.rb b/app/models/trends/tag_batch.rb
index b9330745f..16ee08c06 100644
--- a/app/models/form/tag_batch.rb
+++ b/app/models/trends/tag_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::TagBatch
+class Trends::TagBatch
   include ActiveModel::Model
   include Authorization
 
@@ -22,12 +22,12 @@ class Form::TagBatch
   end
 
   def approve!
-    tags.each { |tag| authorize(tag, :update?) }
+    tags.each { |tag| authorize(tag, :review?) }
     tags.update_all(trendable: true, reviewed_at: action_time)
   end
 
   def reject!
-    tags.each { |tag| authorize(tag, :update?) }
+    tags.each { |tag| authorize(tag, :review?) }
     tags.update_all(trendable: false, reviewed_at: action_time)
   end
 
diff --git a/app/models/tag_filter.rb b/app/models/trends/tag_filter.rb
index ecdb52503..3b142efc4 100644
--- a/app/models/tag_filter.rb
+++ b/app/models/trends/tag_filter.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class TagFilter
+class Trends::TagFilter
   KEYS = %i(
     trending
     status
@@ -42,13 +42,7 @@ class TagFilter
   end
 
   def trending_scope
-    ids = Trends.tags.currently_trending_ids(false, -1)
-
-    if ids.empty?
-      Tag.none
-    else
-      Tag.joins("join unnest(array[#{ids.map(&:to_i).join(',')}]::integer[]) with ordinality as x (id, ordering) on tags.id = x.id").order('x.ordering')
-    end
+    Trends.tags.query.to_arel
   end
 
   def status_scope(value)
diff --git a/app/models/trends/tags.rb b/app/models/trends/tags.rb
index 2ea4550df..3caa58815 100644
--- a/app/models/trends/tags.rb
+++ b/app/models/trends/tags.rb
@@ -5,7 +5,7 @@ class Trends::Tags < Trends::Base
 
   self.default_options = {
     threshold: 5,
-    review_threshold: 10,
+    review_threshold: 3,
     max_score_cooldown: 2.days.freeze,
     max_score_halflife: 4.hours.freeze,
   }
@@ -29,27 +29,15 @@ class Trends::Tags < Trends::Base
     trim_older_items
   end
 
-  def get(allowed, limit)
-    tag_ids = currently_trending_ids(allowed, limit)
-    tags = Tag.where(id: tag_ids).index_by(&:id)
-    tag_ids.map { |id| tags[id] }.compact
-  end
-
   def request_review
     tags = Tag.where(id: currently_trending_ids(false, -1))
 
-    tags_requiring_review = tags.filter_map do |tag|
+    tags.filter_map do |tag|
       next unless would_be_trending?(tag.id) && !tag.trendable? && tag.requires_review_notification?
 
       tag.touch(:requested_review_at)
       tag
     end
-
-    return if tags_requiring_review.empty?
-
-    User.staff.includes(:account).find_each do |user|
-      AdminMailer.new_trending_tags(user.account, tags_requiring_review).deliver_later! if user.allows_trending_tag_emails?
-    end
   end
 
   protected
@@ -58,6 +46,10 @@ class Trends::Tags < Trends::Base
     PREFIX
   end
 
+  def klass
+    Tag
+  end
+
   private
 
   def calculate_scores(tags, at_time)
@@ -87,18 +79,10 @@ class Trends::Tags < Trends::Base
 
       decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
 
-      if decaying_score.zero?
-        redis.zrem("#{PREFIX}:all", tag.id)
-        redis.zrem("#{PREFIX}:allowed", tag.id)
-      else
-        redis.zadd("#{PREFIX}:all", decaying_score, tag.id)
-
-        if tag.trendable?
-          redis.zadd("#{PREFIX}:allowed", decaying_score, tag.id)
-        else
-          redis.zrem("#{PREFIX}:allowed", tag.id)
-        end
-      end
+      add_to_and_remove_from_subsets(tag.id, decaying_score, {
+        all: true,
+        allowed: tag.trendable?,
+      })
     end
   end
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 517254a91..bbf850d84 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -269,7 +269,7 @@ class User < ApplicationRecord
     settings.notification_emails['appeal']
   end
 
-  def allows_trending_tag_emails?
+  def allows_trends_review_emails?
     settings.notification_emails['trending_tag']
   end
 
diff --git a/app/policies/account_policy.rb b/app/policies/account_policy.rb
index 46237e45c..cc23771e7 100644
--- a/app/policies/account_policy.rb
+++ b/app/policies/account_policy.rb
@@ -68,4 +68,8 @@ class AccountPolicy < ApplicationPolicy
   def unblock_email?
     staff?
   end
+
+  def review?
+    staff?
+  end
 end
diff --git a/app/policies/preview_card_policy.rb b/app/policies/preview_card_policy.rb
index 4f485d7fc..0410987e4 100644
--- a/app/policies/preview_card_policy.rb
+++ b/app/policies/preview_card_policy.rb
@@ -5,7 +5,7 @@ class PreviewCardPolicy < ApplicationPolicy
     staff?
   end
 
-  def update?
+  def review?
     staff?
   end
 end
diff --git a/app/policies/preview_card_provider_policy.rb b/app/policies/preview_card_provider_policy.rb
index 598d54a5e..44d2ad5cf 100644
--- a/app/policies/preview_card_provider_policy.rb
+++ b/app/policies/preview_card_provider_policy.rb
@@ -5,7 +5,7 @@ class PreviewCardProviderPolicy < ApplicationPolicy
     staff?
   end
 
-  def update?
+  def review?
     staff?
   end
 end
diff --git a/app/policies/status_policy.rb b/app/policies/status_policy.rb
index 6e9b840db..400f1ec79 100644
--- a/app/policies/status_policy.rb
+++ b/app/policies/status_policy.rb
@@ -41,6 +41,10 @@ class StatusPolicy < ApplicationPolicy
     staff? || owned?
   end
 
+  def review?
+    staff?
+  end
+
   private
 
   def requires_mention?
diff --git a/app/policies/tag_policy.rb b/app/policies/tag_policy.rb
index aaf70fcab..bdfcec0c9 100644
--- a/app/policies/tag_policy.rb
+++ b/app/policies/tag_policy.rb
@@ -12,4 +12,8 @@ class TagPolicy < ApplicationPolicy
   def update?
     staff?
   end
+
+  def review?
+    staff?
+  end
 end
diff --git a/app/services/delete_account_service.rb b/app/services/delete_account_service.rb
index a572a7c59..a2d535d26 100644
--- a/app/services/delete_account_service.rb
+++ b/app/services/delete_account_service.rb
@@ -220,21 +220,23 @@ class DeleteAccountService < BaseService
 
     return unless keep_account_record?
 
-    @account.silenced_at       = nil
-    @account.suspended_at      = @options[:suspended_at] || Time.now.utc
-    @account.suspension_origin = :local
-    @account.locked            = false
-    @account.memorial          = false
-    @account.discoverable      = false
-    @account.display_name      = ''
-    @account.note              = ''
-    @account.fields            = []
-    @account.statuses_count    = 0
-    @account.followers_count   = 0
-    @account.following_count   = 0
-    @account.moved_to_account  = nil
-    @account.also_known_as     = []
-    @account.trust_level       = :untrusted
+    @account.silenced_at         = nil
+    @account.suspended_at        = @options[:suspended_at] || Time.now.utc
+    @account.suspension_origin   = :local
+    @account.locked              = false
+    @account.memorial            = false
+    @account.discoverable        = false
+    @account.trendable           = false
+    @account.display_name        = ''
+    @account.note                = ''
+    @account.fields              = []
+    @account.statuses_count      = 0
+    @account.followers_count     = 0
+    @account.following_count     = 0
+    @account.moved_to_account    = nil
+    @account.reviewed_at         = nil
+    @account.requested_review_at = nil
+    @account.also_known_as       = []
     @account.avatar.destroy
     @account.header.destroy
     @account.save!
diff --git a/app/services/favourite_service.rb b/app/services/favourite_service.rb
index a0ab3b4b7..0ca0081b4 100644
--- a/app/services/favourite_service.rb
+++ b/app/services/favourite_service.rb
@@ -17,6 +17,8 @@ class FavouriteService < BaseService
 
     favourite = Favourite.create!(account: account, status: status)
 
+    Trends.statuses.register(status)
+
     create_notification(favourite)
     bump_potential_friendship(account, status)
 
diff --git a/app/services/reblog_service.rb b/app/services/reblog_service.rb
index 2d1265f10..7d2981709 100644
--- a/app/services/reblog_service.rb
+++ b/app/services/reblog_service.rb
@@ -30,8 +30,7 @@ class ReblogService < BaseService
 
     reblog = account.statuses.create!(reblog: reblogged_status, text: '', visibility: visibility, rate_limit: options[:with_rate_limit])
 
-    Trends.tags.register(reblog)
-    Trends.links.register(reblog)
+    Trends.register!(reblog)
     DistributionWorker.perform_async(reblog.id)
     ActivityPub::DistributionWorker.perform_async(reblog.id)
 
diff --git a/app/views/admin/custom_emojis/_custom_emoji.html.haml b/app/views/admin/custom_emojis/_custom_emoji.html.haml
index 526c844e9..41f3975cf 100644
--- a/app/views/admin/custom_emojis/_custom_emoji.html.haml
+++ b/app/views/admin/custom_emojis/_custom_emoji.html.haml
@@ -3,7 +3,7 @@
     = f.check_box :custom_emoji_ids, { multiple: true, include_hidden: false }, custom_emoji.id
   .batch-table__row__content.batch-table__row__content--with-image
     .batch-table__row__content__image
-      = custom_emoji_tag(custom_emoji, animate = current_account&.user&.setting_auto_play_gif)
+      = custom_emoji_tag(custom_emoji, current_account&.user&.setting_auto_play_gif)
 
     .batch-table__row__content__text
       %samp= ":#{custom_emoji.shortcode}:"
diff --git a/app/views/admin/follow_recommendations/show.html.haml b/app/views/admin/follow_recommendations/show.html.haml
index 272681864..ebc4a2c6b 100644
--- a/app/views/admin/follow_recommendations/show.html.haml
+++ b/app/views/admin/follow_recommendations/show.html.haml
@@ -9,12 +9,14 @@
 %hr.spacer/
 
 = form_tag admin_follow_recommendations_path, method: 'GET', class: 'simple_form' do
+  - RelationshipFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
   .filters
     .filter-subset.filter-subset--with-select
       %strong= t('admin.follow_recommendations.language')
       .input.select.optional
-        = select_tag :language, options_for_select(I18n.available_locales.map { |key| key.to_s.split(/[_-]/).first.to_sym }.uniq.map { |key| [standard_locale_name(key), key]}, @language)
-
+        = select_tag :language, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key] }, @language)
     .filter-subset
       %strong= t('admin.follow_recommendations.status')
       %ul
diff --git a/app/views/admin/trends/links/index.html.haml b/app/views/admin/trends/links/index.html.haml
index 240ae722b..79f3513d3 100644
--- a/app/views/admin/trends/links/index.html.haml
+++ b/app/views/admin/trends/links/index.html.haml
@@ -4,23 +4,29 @@
 - content_for :header_tags do
   = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
 
-.filters
-  .filter-subset
-    %strong= t('admin.trends.trending')
-    %ul
-      %li= filter_link_to t('generic.all'), trending: nil
-      %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
-  .back-link
-    = link_to admin_trends_links_preview_card_providers_path do
-      = t('admin.trends.preview_card_providers.title')
-      = fa_icon 'chevron-right fw'
+= form_tag admin_trends_links_path, method: 'GET', class: 'simple_form' do
+  - Trends::PreviewCardFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
 
-%hr.spacer/
+  .filters
+    .filter-subset.filter-subset--with-select
+      %strong= t('admin.follow_recommendations.language')
+      .input.select.optional
+        = select_tag :locale, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key] }, params[:locale]), include_blank: true
+    .filter-subset
+      %strong= t('admin.trends.trending')
+      %ul
+        %li= filter_link_to t('generic.all'), trending: nil
+        %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
+    .back-link
+      = link_to admin_trends_links_preview_card_providers_path do
+        = t('admin.trends.preview_card_providers.title')
+        = fa_icon 'chevron-right fw'
 
 = form_for(@form, url: batch_admin_trends_links_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - PreviewCardFilter::KEYS.each do |key|
+  - Trends::PreviewCardFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table
@@ -29,9 +35,9 @@
         = check_box_tag :batch_checkbox_all, nil, false
       .batch-table__toolbar__actions
         = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow')]), name: :approve, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
-        = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow_provider')]), name: :approve_all, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow_provider')]), name: :approve_providers, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
         = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow')]), name: :reject, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
-        = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow_provider')]), name: :reject_all, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow_provider')]), name: :reject_providers, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
     .batch-table__body
       - if @preview_cards.empty?
         = nothing_here 'nothing-here--under-tabs'
diff --git a/app/views/admin/trends/links/preview_card_providers/index.html.haml b/app/views/admin/trends/links/preview_card_providers/index.html.haml
index eac6e641f..b79349947 100644
--- a/app/views/admin/trends/links/preview_card_providers/index.html.haml
+++ b/app/views/admin/trends/links/preview_card_providers/index.html.haml
@@ -23,7 +23,7 @@
 = form_for(@form, url: batch_admin_trends_links_preview_card_providers_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - PreviewCardProviderFilter::KEYS.each do |key|
+  - Trends::PreviewCardProviderFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table.optional
diff --git a/app/views/admin/trends/statuses/_status.html.haml b/app/views/admin/trends/statuses/_status.html.haml
new file mode 100644
index 000000000..c99ee5d60
--- /dev/null
+++ b/app/views/admin/trends/statuses/_status.html.haml
@@ -0,0 +1,30 @@
+.batch-table__row{ class: [status.account.requires_review? && 'batch-table__row--attention', !status.account.requires_review? && !status.trendable? && 'batch-table__row--muted'] }
+  %label.batch-table__row__select.batch-table__row__select--aligned.batch-checkbox
+    = f.check_box :status_ids, { multiple: true, include_hidden: false }, status.id
+
+  .batch-table__row__content.pending-account__header
+    .one-liner
+      = admin_account_link_to status.account
+
+      = link_to ActivityPub::TagManager.instance.url_for(status), target: '_blank', class: 'emojify', rel: 'noopener noreferrer' do
+        = one_line_preview(status)
+
+        - status.media_attachments.each do |media_attachment|
+          %abbr{ title: media_attachment.description }
+            = fa_icon 'link'
+            = media_attachment.file_file_name
+
+    = t('admin.trends.statuses.shared_by', count: status.reblogs_count + status.favourites_count, friendly_count: friendly_number_to_human(status.reblogs_count + status.favourites_count))
+
+    - if status.account.domain.present?
+      •
+      = status.account.domain
+    - if status.language.present?
+      •
+      = standard_locale_name(status.language)
+    - if status.trendable? && (rank = Trends.statuses.rank(status.id))
+      •
+      %abbr{ title: t('admin.trends.tags.current_score', score: Trends.statuses.score(status.id)) }= t('admin.trends.tags.trending_rank', rank: rank + 1)
+    - elsif status.account.requires_review?
+      •
+      = t('admin.trends.pending_review')
diff --git a/app/views/admin/trends/statuses/index.html.haml b/app/views/admin/trends/statuses/index.html.haml
new file mode 100644
index 000000000..347688262
--- /dev/null
+++ b/app/views/admin/trends/statuses/index.html.haml
@@ -0,0 +1,43 @@
+- content_for :page_title do
+  = t('admin.trends.statuses.title')
+
+- content_for :header_tags do
+  = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
+
+= form_tag admin_trends_statuses_path, method: 'GET', class: 'simple_form' do
+  - Trends::StatusFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
+  .filters
+    .filter-subset.filter-subset--with-select
+      %strong= t('admin.follow_recommendations.language')
+      .input.select.optional
+        = select_tag :locale, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key]}, params[:locale]), include_blank: true
+    .filter-subset
+      %strong= t('admin.trends.trending')
+      %ul
+        %li= filter_link_to t('generic.all'), trending: nil
+        %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
+
+= form_for(@form, url: batch_admin_trends_statuses_path) do |f|
+  = hidden_field_tag :page, params[:page] || 1
+
+  - Trends::StatusFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
+  .batch-table
+    .batch-table__toolbar
+      %label.batch-table__toolbar__select.batch-checkbox-all
+        = check_box_tag :batch_checkbox_all, nil, false
+      .batch-table__toolbar__actions
+        = f.button safe_join([fa_icon('check'), t('admin.trends.statuses.allow')]), name: :approve, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('check'), t('admin.trends.statuses.allow_account')]), name: :approve_accounts, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.statuses.disallow')]), name: :reject, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.statuses.disallow_account')]), name: :reject_accounts, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+    .batch-table__body
+      - if @statuses.empty?
+        = nothing_here 'nothing-here--under-tabs'
+      - else
+        = render partial: 'status', collection: @statuses, locals: { f: f }
+
+= paginate @statuses
diff --git a/app/views/admin/trends/tags/index.html.haml b/app/views/admin/trends/tags/index.html.haml
index 8df0a9920..8a2f785bc 100644
--- a/app/views/admin/trends/tags/index.html.haml
+++ b/app/views/admin/trends/tags/index.html.haml
@@ -13,12 +13,10 @@
       %li= filter_link_to t('admin.trends.rejected'), status: 'rejected'
       %li= filter_link_to safe_join([t('admin.accounts.moderation.pending'), "(#{Tag.pending_review.count})"], ' '), status: 'pending_review'
 
-%hr.spacer/
-
 = form_for(@form, url: batch_admin_trends_tags_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - TagFilter::KEYS.each do |key|
+  - Trends::TagFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table.optional
diff --git a/app/views/admin_mailer/_new_trending_links.text.erb b/app/views/admin_mailer/_new_trending_links.text.erb
new file mode 100644
index 000000000..405926fdd
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_links.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_links.title') %>
+
+<% @links.each do |link| %>
+- <%= link.title %> • <%= link.url %>
+  <%= raw t('admin.trends.links.usage_comparison', today: link.history.get(Time.now.utc).accounts, yesterday: link.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.links.score(link.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_link %>
+<%= raw t('admin_mailer.new_trends.new_trending_links.requirements', lowest_link_title: @lowest_trending_link.title, lowest_link_score: Trends.links.score(@lowest_trending_link.id).round(2), rank: Trends.links.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_links.no_approved_links') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_links_url %>
diff --git a/app/views/admin_mailer/_new_trending_statuses.text.erb b/app/views/admin_mailer/_new_trending_statuses.text.erb
new file mode 100644
index 000000000..8d11a80c2
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_statuses.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.title') %>
+
+<% @statuses.each do |status| %>
+- <%= ActivityPub::TagManager.instance.url_for(status) %>
+  <%= raw t('admin.trends.tags.current_score', score: Trends.statuses.score(status.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_status %>
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.requirements', lowest_status_url: ActivityPub::TagManager.instance.url_for(@lowest_trending_status), lowest_status_score: Trends.statuses.score(@lowest_trending_status.id).round(2), rank: Trends.statuses.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.no_approved_statuses') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_statuses_url %>
diff --git a/app/views/admin_mailer/_new_trending_tags.text.erb b/app/views/admin_mailer/_new_trending_tags.text.erb
new file mode 100644
index 000000000..49fe84309
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_tags.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_tags.title') %>
+
+<% @tags.each do |tag| %>
+- #<%= tag.name %>
+  <%= raw t('admin.trends.tags.usage_comparison', today: tag.history.get(Time.now.utc).accounts, yesterday: tag.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_tag %>
+<%= raw t('admin_mailer.new_trends.new_trending_tags.requirements', lowest_tag_name: @lowest_trending_tag.name, lowest_tag_score: Trends.tags.score(@lowest_trending_tag.id).round(2), rank: Trends.tags.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_tags.no_approved_tags') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_tags_url(pending_review: '1') %>
diff --git a/app/views/admin_mailer/new_trending_links.text.erb b/app/views/admin_mailer/new_trending_links.text.erb
deleted file mode 100644
index 51789aca5..000000000
--- a/app/views/admin_mailer/new_trending_links.text.erb
+++ /dev/null
@@ -1,16 +0,0 @@
-<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
-
-<%= raw t('admin_mailer.new_trending_links.body') %>
-
-<% @links.each do |link| %>
-- <%= link.title %> • <%= link.url %>
-  <%= t('admin.trends.links.usage_comparison', today: link.history.get(Time.now.utc).accounts, yesterday: link.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.links.score(link.id).round(2)) %>
-<% end %>
-
-<% if @lowest_trending_link %>
-<%= t('admin_mailer.new_trending_links.requirements', lowest_link_title: @lowest_trending_link.title, lowest_link_score: Trends.links.score(@lowest_trending_link.id).round(2)) %>
-<% else %>
-<%= t('admin_mailer.new_trending_links.no_approved_links') %>
-<% end %>
-
-<%= raw t('application_mailer.view')%> <%= admin_trends_links_url %>
diff --git a/app/views/admin_mailer/new_trending_tags.text.erb b/app/views/admin_mailer/new_trending_tags.text.erb
deleted file mode 100644
index 9ea31fa7c..000000000
--- a/app/views/admin_mailer/new_trending_tags.text.erb
+++ /dev/null
@@ -1,16 +0,0 @@
-<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
-
-<%= raw t('admin_mailer.new_trending_tags.body') %>
-
-<% @tags.each do |tag| %>
-- #<%= tag.name %>
-  <%= t('admin.trends.tags.usage_comparison', today: tag.history.get(Time.now.utc).accounts, yesterday: tag.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id).round(2)) %>
-<% end %>
-
-<% if @lowest_trending_tag %>
-<%= t('admin_mailer.new_trending_tags.requirements', lowest_tag_name: @lowest_trending_tag.name, lowest_tag_score: Trends.tags.score(@lowest_trending_tag.id).round(2)) %>
-<% else %>
-<%= t('admin_mailer.new_trending_tags.no_approved_tags') %>
-<% end %>
-
-<%= raw t('application_mailer.view')%> <%= admin_trends_tags_url(status: 'pending_review') %>
diff --git a/app/views/admin_mailer/new_trends.text.erb b/app/views/admin_mailer/new_trends.text.erb
new file mode 100644
index 000000000..13b296846
--- /dev/null
+++ b/app/views/admin_mailer/new_trends.text.erb
@@ -0,0 +1,13 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('admin_mailer.new_trends.body') %>
+
+<% unless @links.empty? %>
+<%= render 'new_trending_links' %>
+<% end %>
+<% unless @tags.empty? %>
+<%= render 'new_trending_tags' unless @tags.empty? %>
+<% end %>
+<% unless @statuses.empty? %>
+<%= render 'new_trending_statuses' unless @statuses.empty? %>
+<% end %>
diff --git a/app/views/application/_sidebar.html.haml b/app/views/application/_sidebar.html.haml
index 6826c3b58..e97c493fe 100644
--- a/app/views/application/_sidebar.html.haml
+++ b/app/views/application/_sidebar.html.haml
@@ -6,7 +6,7 @@
     %p= @instance_presenter.site_short_description.html_safe.presence || t('about.about_mastodon_html')
 
 - if Setting.trends && !(user_signed_in? && !current_user.setting_trends)
-  - trends = Trends.tags.get(true, 3)
+  - trends = Trends.tags.query.allowed.limit(3)
 
   - unless trends.empty?
     .endorsements-widget.trends-widget
diff --git a/app/workers/scheduler/follow_recommendations_scheduler.rb b/app/workers/scheduler/follow_recommendations_scheduler.rb
index 084619cbd..57f78170e 100644
--- a/app/workers/scheduler/follow_recommendations_scheduler.rb
+++ b/app/workers/scheduler/follow_recommendations_scheduler.rb
@@ -18,7 +18,7 @@ class Scheduler::FollowRecommendationsScheduler
 
     fallback_recommendations = FollowRecommendation.order(rank: :desc).limit(SET_SIZE)
 
-    I18n.available_locales.map { |locale| locale.to_s.split(/[_-]/).first }.uniq.each do |locale|
+    Trends.available_locales.each do |locale|
       recommendations = begin
         if AccountSummary.safe.filtered.localized(locale).exists? # We can skip the work if no accounts with that language exist
           FollowRecommendation.localized(locale).order(rank: :desc).limit(SET_SIZE).map { |recommendation| [recommendation.account_id, recommendation.rank] }
@@ -49,11 +49,11 @@ class Scheduler::FollowRecommendationsScheduler
         end
       end
 
-      redis.pipelined do
-        redis.del(key(locale))
+      redis.multi do |multi|
+        multi.del(key(locale))
 
         recommendations.each do |(account_id, rank)|
-          redis.zadd(key(locale), rank, account_id)
+          multi.zadd(key(locale), rank, account_id)
         end
       end
     end