diff --git a/.buildpacks b/.buildpacks
index c232c712f7..3450683ce8 100644
--- a/.buildpacks
+++ b/.buildpacks
@@ -1,3 +1,4 @@
 https://github.com/heroku/heroku-buildpack-apt
+https://github.com/Scalingo/ffmpeg-buildpack
 https://github.com/Scalingo/nodejs-buildpack
 https://github.com/Scalingo/ruby-buildpack
diff --git a/app/javascript/mastodon/.gitkeep b/app/javascript/mastodon/.gitkeep
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/app/javascript/mastodon/components/scrollable_list.js b/app/javascript/mastodon/components/scrollable_list.js
index 4b433f32c3..5c888650c3 100644
--- a/app/javascript/mastodon/components/scrollable_list.js
+++ b/app/javascript/mastodon/components/scrollable_list.js
@@ -26,6 +26,7 @@ export default class ScrollableList extends PureComponent {
     hasMore: PropTypes.bool,
     prepend: PropTypes.node,
     alwaysPrepend: PropTypes.bool,
+    alwaysShowScrollbar: PropTypes.bool,
     emptyMessage: PropTypes.node,
     children: PropTypes.node,
   };
@@ -141,7 +142,7 @@ export default class ScrollableList extends PureComponent {
   }
 
   render () {
-    const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, alwaysPrepend, emptyMessage, onLoadMore } = this.props;
+    const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, alwaysPrepend, alwaysShowScrollbar, emptyMessage, onLoadMore } = this.props;
     const { fullscreen } = this.state;
     const childrenCount = React.Children.count(children);
 
@@ -172,11 +173,13 @@ export default class ScrollableList extends PureComponent {
         </div>
       );
     } else {
+      const scrollable = alwaysShowScrollbar;
+
       scrollableArea = (
-        <div style={{ flex: '1 1 auto', display: 'flex', flexDirection: 'column' }}>
+        <div className={classNames({ scrollable, fullscreen })} ref={this.setRef} style={{ flex: '1 1 auto', display: 'flex', flexDirection: 'column' }}>
           {alwaysPrepend && prepend}
 
-          <div className='empty-column-indicator' ref={this.setRef}>
+          <div className='empty-column-indicator'>
             {emptyMessage}
           </div>
         </div>
diff --git a/app/javascript/mastodon/features/followers/index.js b/app/javascript/mastodon/features/followers/index.js
index 5eb05367ef..97d59cc4ac 100644
--- a/app/javascript/mastodon/features/followers/index.js
+++ b/app/javascript/mastodon/features/followers/index.js
@@ -66,13 +66,14 @@ export default class Followers extends ImmutablePureComponent {
       <Column>
         <ColumnBackButton />
 
-        <HeaderContainer accountId={this.props.params.accountId} hideTabs />
-
         <ScrollableList
           scrollKey='followers'
           hasMore={hasMore}
           onLoadMore={this.handleLoadMore}
           shouldUpdateScroll={shouldUpdateScroll}
+          prepend={<HeaderContainer accountId={this.props.params.accountId} hideTabs />}
+          alwaysPrepend
+          alwaysShowScrollbar
           emptyMessage={emptyMessage}
         >
           {accountIds.map(id =>
diff --git a/app/javascript/mastodon/features/following/index.js b/app/javascript/mastodon/features/following/index.js
index 95e786882a..17bc7ec6ed 100644
--- a/app/javascript/mastodon/features/following/index.js
+++ b/app/javascript/mastodon/features/following/index.js
@@ -66,13 +66,14 @@ export default class Following extends ImmutablePureComponent {
       <Column>
         <ColumnBackButton />
 
-        <HeaderContainer accountId={this.props.params.accountId} hideTabs />
-
         <ScrollableList
           scrollKey='following'
           hasMore={hasMore}
           onLoadMore={this.handleLoadMore}
           shouldUpdateScroll={shouldUpdateScroll}
+          prepend={<HeaderContainer accountId={this.props.params.accountId} hideTabs />}
+          alwaysPrepend
+          alwaysShowScrollbar
           emptyMessage={emptyMessage}
         >
           {accountIds.map(id =>
diff --git a/app/javascript/mastodon/locales/zh-TW.json b/app/javascript/mastodon/locales/zh-TW.json
index 5b32a15bb3..09e9150d0a 100644
--- a/app/javascript/mastodon/locales/zh-TW.json
+++ b/app/javascript/mastodon/locales/zh-TW.json
@@ -1,7 +1,7 @@
 {
   "account.badges.bot": "機器人",
   "account.block": "封鎖 @{name}",
-  "account.block_domain": "隱藏來自 {domain} 的一切貼文",
+  "account.block_domain": "隱藏來自 {domain} 的一切嘟文",
   "account.blocked": "已被封鎖的",
   "account.direct": "發送私訊給 @{name}",
   "account.disclaimer_full": "下列資料不一定完整。",
@@ -67,10 +67,10 @@
   "compose_form.direct_message_warning": "這條嘟文僅對有被提及的使用者才能看到。",
   "compose_form.direct_message_warning_learn_more": "了解更多",
   "compose_form.hashtag_warning": "此則推文將不會在任何主題標籤中看見，只有公開的推文可以用主題標籤來搜尋。",
-  "compose_form.lock_disclaimer": "你的帳號沒有{locked}。任何人都可以關注你，看到發給關注者的貼文。",
+  "compose_form.lock_disclaimer": "你的帳號沒有{locked}。任何人都可以關注你，看到發給關注者的嘟文。",
   "compose_form.lock_disclaimer.lock": "上鎖",
   "compose_form.placeholder": "在想些什麼？",
-  "compose_form.publish": "貼掉",
+  "compose_form.publish": "嘟掉",
   "compose_form.publish_loud": "{publish}！",
   "compose_form.sensitive.marked": "此媒體已被標註為敏感的",
   "compose_form.sensitive.unmarked": "此媒體未被標註為敏感的",
@@ -92,7 +92,7 @@
   "confirmations.redraft.message": "你確定要刪除這條嘟文並重新編輯它嗎? 所有相關的回覆、轉嘟與最愛都會被刪除。",
   "confirmations.unfollow.confirm": "取消關注",
   "confirmations.unfollow.message": "真的不要繼續關注 {name} 了嗎？",
-  "embed.instructions": "要內嵌此貼文，請將以下代碼貼進你的網站。",
+  "embed.instructions": "要內嵌此嘟文，請將以下代碼貼進你的網站。",
   "embed.preview": "看上去會變成這樣：",
   "emoji_button.activity": "活動",
   "emoji_button.custom": "自訂",
@@ -118,7 +118,7 @@
   "empty_column.hashtag": "這個主題標籤下什麼都沒有。",
   "empty_column.home": "你還沒關注任何人。造訪{public}或利用搜尋功能找到其他用者。",
   "empty_column.home.public_timeline": "公開時間軸",
-  "empty_column.list": "此份清單尚未有東西。當此清單的成員貼出了新的狀態時，它們就會出現在這裡。",
+  "empty_column.list": "此份清單尚未有東西。當此清單的成員嘟出了新的狀態時，它們就會出現在這裡。",
   "empty_column.lists": "You don't have any lists yet. When you create one, it will show up here.",
   "empty_column.mutes": "You haven't muted any users yet.",
   "empty_column.notifications": "還沒有任何通知。和別的使用者互動來開始對話。",
@@ -246,7 +246,7 @@
   "privacy.direct.short": "私訊",
   "privacy.private.long": "只有關注你的使用者能看到",
   "privacy.private.short": "僅關注者",
-  "privacy.public.long": "貼到公開時間軸",
+  "privacy.public.long": "嘟到公開時間軸",
   "privacy.public.short": "公開",
   "privacy.unlisted.long": "公開，但不會顯示在公開時間軸",
   "privacy.unlisted.short": "不公開",
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 6073f9c0e5..8f279e1382 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -5367,7 +5367,7 @@ noscript {
   dt,
   dd {
     box-sizing: border-box;
-    padding: 14px 20px;
+    padding: 14px 5px;
     text-align: center;
     max-height: 48px;
     overflow: hidden;
diff --git a/scalingo.json b/scalingo.json
index 873731ac9a..dd8fb5530c 100644
--- a/scalingo.json
+++ b/scalingo.json
@@ -91,6 +91,11 @@
       "description": "Internal scalingo configuration",
       "required": true,
       "value": "https://github.com/Scalingo/multi-buildpack.git"
+    },
+    "WITH_FFPROBE": {
+      "description": "Internal scalingo configuration to install ffprobe",
+      "required": true,
+      "value": "true"
     }
   },
   "scripts": {
diff --git a/spec/lib/formatter_spec.rb b/spec/lib/formatter_spec.rb
index b8683e720b..d60d24bf68 100644
--- a/spec/lib/formatter_spec.rb
+++ b/spec/lib/formatter_spec.rb
@@ -5,26 +5,26 @@ RSpec.describe Formatter do
   let(:remote_account) { Fabricate(:account, domain: 'remote.test', username: 'bob', url: 'https://remote.test/') }
 
   shared_examples 'encode and link URLs' do
-    context 'matches a stand-alone medium URL' do
+    context 'given a stand-alone medium URL' do
       let(:text) { 'https://hackernoon.com/the-power-to-build-communities-a-response-to-mark-zuckerberg-3f2cac9148a4' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://hackernoon.com/the-power-to-build-communities-a-response-to-mark-zuckerberg-3f2cac9148a4"'
       end
     end
 
-    context 'matches a stand-alone google URL' do
+    context 'given a stand-alone google URL' do
       let(:text) { 'http://google.com' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="http://google.com"'
       end
     end
 
-    context 'matches a stand-alone IDN URL' do
+    context 'given a stand-alone IDN URL' do
       let(:text) { 'https://nic.みんな/' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://nic.みんな/"'
       end
 
@@ -33,138 +33,138 @@ RSpec.describe Formatter do
       end
     end
 
-    context 'matches a URL without trailing period' do
+    context 'given a URL with a trailing period' do
       let(:text) { 'http://www.mcmansionhell.com/post/156408871451/50-states-of-mcmansion-hell-scottsdale-arizona. ' }
 
-      it 'has valid URL' do
+      it 'matches the full URL but not the period' do
         is_expected.to include 'href="http://www.mcmansionhell.com/post/156408871451/50-states-of-mcmansion-hell-scottsdale-arizona"'
       end
     end
 
-    context 'matches a URL without closing paranthesis' do
+    context 'given a URL enclosed with parentheses' do
       let(:text) { '(http://google.com/)' }
 
-      it 'has valid URL' do
+      it 'matches the full URL but not the parentheses' do
         is_expected.to include 'href="http://google.com/"'
       end
     end
 
-    context 'matches a URL without exclamation point' do
+    context 'given a URL with a trailing exclamation point' do
       let(:text) { 'http://www.google.com!' }
 
-      it 'has valid URL' do
+      it 'matches the full URL but not the exclamation point' do
         is_expected.to include 'href="http://www.google.com"'
       end
     end
 
-    context 'matches a URL without single quote' do
+    context 'given a URL with a trailing single quote' do
       let(:text) { "http://www.google.com'" }
 
-      it 'has valid URL' do
+      it 'matches the full URL but not the single quote' do
         is_expected.to include 'href="http://www.google.com"'
       end
     end
 
-    context 'matches a URL without angle brackets' do
+    context 'given a URL with a trailing angle bracket' do
       let(:text) { 'http://www.google.com>' }
 
-      it 'has valid URL' do
+      it 'matches the full URL but not the angle bracket' do
         is_expected.to include 'href="http://www.google.com"'
       end
     end
 
-    context 'matches a URL with a query string' do
+    context 'given a URL with a query string' do
       let(:text) { 'https://www.ruby-toolbox.com/search?utf8=%E2%9C%93&q=autolink' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://www.ruby-toolbox.com/search?utf8=%E2%9C%93&amp;q=autolink"'
       end
     end
 
-    context 'matches a URL with parenthesis in it' do
+    context 'given a URL with parentheses in it' do
       let(:text) { 'https://en.wikipedia.org/wiki/Diaspora_(software)' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://en.wikipedia.org/wiki/Diaspora_(software)"'
       end
     end
 
-    context 'matches a URL with Japanese path string' do
+    context 'given a URL with Japanese path string' do
       let(:text) { 'https://ja.wikipedia.org/wiki/日本' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://ja.wikipedia.org/wiki/日本"'
       end
     end
 
-    context 'matches a URL with Korean path string' do
+    context 'given a URL with Korean path string' do
       let(:text) { 'https://ko.wikipedia.org/wiki/대한민국' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://ko.wikipedia.org/wiki/대한민국"'
       end
     end
 
-    context 'matches a URL with Simplified Chinese path string' do
+    context 'given a URL with Simplified Chinese path string' do
       let(:text) { 'https://baike.baidu.com/item/中华人民共和国' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://baike.baidu.com/item/中华人民共和国"'
       end
     end
 
-    context 'matches a URL with Traditional Chinese path string' do
+    context 'given a URL with Traditional Chinese path string' do
       let(:text) { 'https://zh.wikipedia.org/wiki/臺灣' }
 
-      it 'has valid URL' do
+      it 'matches the full URL' do
         is_expected.to include 'href="https://zh.wikipedia.org/wiki/臺灣"'
       end
     end
 
-    context 'contains unsafe URL (XSS attack, visible part)' do
+    context 'given a URL containing unsafe code (XSS attack, visible part)' do
       let(:text) { %q{http://example.com/b<del>b</del>} }
 
-      it 'has escaped HTML' do
+      it 'escapes the HTML in the URL' do
         is_expected.to include '&lt;del&gt;b&lt;/del&gt;'
       end
     end
 
-    context 'contains unsafe URL (XSS attack, invisible part)' do
+    context 'given a URL containing unsafe code (XSS attack, invisible part)' do
       let(:text) { %q{http://example.com/blahblahblahblah/a<script>alert("Hello")</script>} }
 
-      it 'has escaped HTML' do
+      it 'escapes the HTML in the URL' do
         is_expected.to include '&lt;script&gt;alert(&quot;Hello&quot;)&lt;/script&gt;'
       end
     end
 
-    context 'contains HTML (script tag)' do
+    context 'given text containing HTML code (script tag)' do
       let(:text) { '<script>alert("Hello")</script>' }
 
-      it 'has escaped HTML' do
+      it 'escapes the HTML' do
         is_expected.to include '<p>&lt;script&gt;alert(&quot;Hello&quot;)&lt;/script&gt;</p>'
       end
     end
 
-    context 'contains HTML (XSS attack)' do
+    context 'given text containing HTML (XSS attack)' do
       let(:text) { %q{<img src="javascript:alert('XSS');">} }
 
-      it 'has escaped HTML' do
+      it 'escapes the HTML' do
         is_expected.to include '<p>&lt;img src=&quot;javascript:alert(&apos;XSS&apos;);&quot;&gt;</p>'
       end
     end
 
-    context 'contains invalid URL' do
+    context 'given an invalid URL' do
       let(:text) { 'http://www\.google\.com' }
 
-      it 'has raw URL' do
+      it 'outputs the raw URL' do
         is_expected.to eq '<p>http://www\.google\.com</p>'
       end
     end
 
-    context 'contains a hashtag' do
+    context 'given text containing a hashtag' do
       let(:text)  { '#hashtag' }
 
-      it 'has a link' do
+      it 'creates a hashtag link' do
         is_expected.to include '/tags/hashtag" class="mention hashtag" rel="tag">#<span>hashtag</span></a>'
       end
     end
@@ -173,8 +173,8 @@ RSpec.describe Formatter do
   describe '#format' do
     subject { Formatter.instance.format(status) }
 
-    context 'with local status' do
-      context 'with reblog' do
+    context 'given a post with local status' do
+      context 'given a reblogged post' do
         let(:reblog) { Fabricate(:status, account: local_account, text: 'Hello world', uri: nil) }
         let(:status) { Fabricate(:status, reblog: reblog) }
 
@@ -183,15 +183,15 @@ RSpec.describe Formatter do
         end
       end
 
-      context 'contains plain text' do
+      context 'given a post containing plain text' do
         let(:status)  { Fabricate(:status, text: 'text', uri: nil) }
 
-        it 'paragraphizes' do
+        it 'paragraphizes the text' do
           is_expected.to eq '<p>text</p>'
         end
       end
 
-      context 'contains line feeds' do
+      context 'given a post containing line feeds' do
         let(:status)  { Fabricate(:status, text: "line\nfeed", uri: nil) }
 
         it 'removes line feeds' do
@@ -199,18 +199,18 @@ RSpec.describe Formatter do
         end
       end
 
-      context 'contains linkable mentions' do
+      context 'given a post containing linkable mentions' do
         let(:status) { Fabricate(:status, mentions: [ Fabricate(:mention, account: local_account) ], text: '@alice') }
 
-        it 'links' do
+        it 'creates a mention link' do
           is_expected.to include '<a href="https://cb6e6126.ngrok.io/@alice" class="u-url mention">@<span>alice</span></a></span>'
         end
       end
 
-      context 'contains unlinkable mentions' do
+      context 'given a post containing unlinkable mentions' do
         let(:status) { Fabricate(:status, text: '@alice', uri: nil) }
 
-        it 'does not link' do
+        it 'does not create a mention link' do
           is_expected.to include '@alice'
         end
       end
@@ -224,29 +224,29 @@ RSpec.describe Formatter do
         include_examples 'encode and link URLs'
       end
 
-      context 'with custom_emojify option' do
+      context 'given a post with custom_emojify option' do
         let!(:emoji) { Fabricate(:custom_emoji) }
         let(:status) { Fabricate(:status, account: local_account, text: text) }
 
         subject { Formatter.instance.format(status, custom_emojify: true) }
 
-        context 'with emoji at the start' do
+        context 'given a post with an emoji shortcode at the start' do
           let(:text) { ':coolcat: Beep boop' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/<p><img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with emoji in the middle' do
+        context 'given a post with an emoji shortcode in the middle' do
           let(:text) { 'Beep :coolcat: boop' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/Beep <img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with concatenated emoji' do
+        context 'given a post with concatenated emoji shortcodes' do
           let(:text) { ':coolcat::coolcat:' }
 
           it 'does not touch the shortcodes' do
@@ -254,46 +254,46 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with emoji at the end' do
+        context 'given a post with an emoji shortcode at the end' do
           let(:text) { 'Beep boop :coolcat:' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/boop <img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
       end
     end
 
-    context 'with remote status' do
+    context 'given a post with remote status' do
       let(:status) { Fabricate(:status, account: remote_account, text: 'Beep boop') }
 
-      it 'reformats' do
+      it 'reformats the post' do
         is_expected.to eq 'Beep boop'
       end
 
-      context 'with custom_emojify option' do
+      context 'given a post with custom_emojify option' do
         let!(:emoji) { Fabricate(:custom_emoji, domain: remote_account.domain) }
         let(:status) { Fabricate(:status, account: remote_account, text: text) }
 
         subject { Formatter.instance.format(status, custom_emojify: true) }
 
-        context 'with emoji at the start' do
+        context 'given a post with an emoji shortcode at the start' do
           let(:text) { '<p>:coolcat: Beep boop<br />' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/<p><img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with emoji in the middle' do
+        context 'given a post with an emoji shortcode in the middle' do
           let(:text) { '<p>Beep :coolcat: boop</p>' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/Beep <img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with concatenated emoji' do
+        context 'given a post with concatenated emoji' do
           let(:text) { '<p>:coolcat::coolcat:</p>' }
 
           it 'does not touch the shortcodes' do
@@ -301,10 +301,10 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with emoji at the end' do
+        context 'given a post with an emoji shortcode at the end' do
           let(:text) { '<p>Beep boop<br />:coolcat:</p>' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/<br><img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
@@ -315,26 +315,26 @@ RSpec.describe Formatter do
   describe '#reformat' do
     subject { Formatter.instance.reformat(text) }
 
-    context 'contains plain text' do
+    context 'given a post containing plain text' do
       let(:text) { 'Beep boop' }
 
-      it 'contains plain text' do
+      it 'keeps the plain text' do
         is_expected.to include 'Beep boop'
       end
     end
 
-    context 'contains scripts' do
+    context 'given a post containing script tags' do
       let(:text) { '<script>alert("Hello")</script>' }
 
-      it 'strips scripts' do
+      it 'strips the scripts' do
         is_expected.to_not include '<script>alert("Hello")</script>'
       end
     end
 
-    context 'contains malicious classes' do
+    context 'given a post containing malicious classes' do
       let(:text) { '<span class="mention	status__content__spoiler-link">Show more</span>' }
 
-      it 'strips malicious classes' do
+      it 'strips the malicious classes' do
         is_expected.to_not include 'status__content__spoiler-link'
       end
     end
@@ -343,15 +343,15 @@ RSpec.describe Formatter do
   describe '#plaintext' do
     subject { Formatter.instance.plaintext(status) }
 
-    context 'with local status' do
+    context 'given a post with local status' do
       let(:status)  { Fabricate(:status, text: '<p>a text by a nerd who uses an HTML tag in text</p>', uri: nil) }
 
-      it 'returns raw text' do
+      it 'returns the raw text' do
         is_expected.to eq '<p>a text by a nerd who uses an HTML tag in text</p>'
       end
     end
 
-    context 'with remote status' do
+    context 'given a post with remote status' do
       let(:status)  { Fabricate(:status, account: remote_account, text: '<script>alert("Hello")</script>') }
 
       it 'returns tag-stripped text' do
@@ -363,60 +363,60 @@ RSpec.describe Formatter do
   describe '#simplified_format' do
     subject { Formatter.instance.simplified_format(account) }
 
-    context 'with local status' do
+    context 'given a post with local status' do
       let(:account) { Fabricate(:account, domain: nil, note: text) }
 
-      context 'contains linkable mentions for local accounts' do
+      context 'given a post containing linkable mentions for local accounts' do
         let(:text) { '@alice' }
 
         before { local_account }
 
-        it 'links' do
+        it 'creates a mention link' do
           is_expected.to eq '<p><span class="h-card"><a href="https://cb6e6126.ngrok.io/@alice" class="u-url mention">@<span>alice</span></a></span></p>'
         end
       end
 
-      context 'contains linkable mentions for remote accounts' do
+      context 'given a post containing linkable mentions for remote accounts' do
         let(:text) { '@bob@remote.test' }
 
         before { remote_account }
 
-        it 'links' do
+        it 'creates a mention link' do
           is_expected.to eq '<p><span class="h-card"><a href="https://remote.test/" class="u-url mention">@<span>bob</span></a></span></p>'
         end
       end
 
-      context 'contains unlinkable mentions' do
+      context 'given a post containing unlinkable mentions' do
         let(:text) { '@alice' }
 
-        it 'returns raw mention texts' do
+        it 'does not create a mention link' do
           is_expected.to eq '<p>@alice</p>'
         end
       end
 
-      context 'with custom_emojify option' do
+      context 'given a post with custom_emojify option' do
         let!(:emoji) { Fabricate(:custom_emoji) }
 
         before { account.note = text }
         subject { Formatter.instance.simplified_format(account, custom_emojify: true) }
 
-        context 'with emoji at the start' do
+        context 'given a post with an emoji shortcode at the start' do
           let(:text) { ':coolcat: Beep boop' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/<p><img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with emoji in the middle' do
+        context 'given a post with an emoji shortcode in the middle' do
           let(:text) { 'Beep :coolcat: boop' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/Beep <img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
 
-        context 'with concatenated emoji' do
+        context 'given a post with concatenated emoji shortcodes' do
           let(:text) { ':coolcat::coolcat:' }
 
           it 'does not touch the shortcodes' do
@@ -424,10 +424,10 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with emoji at the end' do
+        context 'given a post with an emoji shortcode at the end' do
           let(:text) { 'Beep boop :coolcat:' }
 
-          it 'converts shortcode to image tag' do
+          it 'converts the shortcode to an image tag' do
             is_expected.to match(/boop <img draggable="false" class="emojione" alt=":coolcat:"/)
           end
         end
@@ -436,7 +436,7 @@ RSpec.describe Formatter do
       include_examples 'encode and link URLs'
     end
 
-    context 'with remote status' do
+    context 'given a post with remote status' do
       let(:text) { '<script>alert("Hello")</script>' }
       let(:account) { Fabricate(:account, domain: 'remote', note: text) }
 
@@ -451,7 +451,7 @@ RSpec.describe Formatter do
 
         subject { Formatter.instance.simplified_format(remote_account, custom_emojify: true) }
 
-        context 'with emoji at the start' do
+        context 'given a post with an emoji shortcode at the start' do
           let(:text) { '<p>:coolcat: Beep boop<br />' }
 
           it 'converts shortcode to image tag' do
@@ -459,7 +459,7 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with emoji in the middle' do
+        context 'given a post with an emoji shortcode in the middle' do
           let(:text) { '<p>Beep :coolcat: boop</p>' }
 
           it 'converts shortcode to image tag' do
@@ -467,7 +467,7 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with concatenated emoji' do
+        context 'given a post with concatenated emoji shortcodes' do
           let(:text) { '<p>:coolcat::coolcat:</p>' }
 
           it 'does not touch the shortcodes' do
@@ -475,7 +475,7 @@ RSpec.describe Formatter do
           end
         end
 
-        context 'with emoji at the end' do
+        context 'given a post with an emoji shortcode at the end' do
           let(:text) { '<p>Beep boop<br />:coolcat:</p>' }
 
           it 'converts shortcode to image tag' do