X Glossary, 40 Terms Every Creator and Founder Should Know
Plain-English definitions of X terms, from reply guy and ratio to Community Notes, impressions and X Premium, with examples and growth tips.
- BookmarksBookmarks let you save posts on X to read later. Only you can see what you saved, while authors see a total bookmark count.
- Community NotesCommunity Notes are crowd-written fact checks added under posts on X. A note shows only when raters who usually disagree both find it helpful.
- SubscriptionsCreator Subscriptions let your followers pay you monthly on X for subscriber-only posts, a badge and closer access. Here is how they work.
- ImpressionsImpressions on X count how many times a post was shown on screen. One person seeing a post twice counts as two impressions.
- ListsLists on X are custom timelines of accounts you choose. You can make up to 1,000 Lists with up to 5,000 accounts each, public or private.
- SpacesSpaces are live audio conversations on X. A host starts one from the mobile app, invites speakers and anyone can listen in.
- TrendsTrends on X are the topics, names and hashtags getting a burst of attention right now, tailored to who you follow, your interests and location.
- Build in publicBuild in public means sharing how you make a product as you go, with real numbers, wins, mistakes and decisions, so an audience grows alongside it.
- RatioGetting ratioed on X means a reply or quote post gets more likes than the post it answers, a sign the crowd sides with the response.
- MuteMuting on X hides an account's posts from your timeline without unfollowing or blocking them. They are not told, and you can unmute any time.
- VerifiedVerified on X means an account carries a blue, gold or grey checkmark. Blue comes with a paid subscription, gold marks organisations, grey governments.
- ViralityVirality is when a post spreads far beyond your followers because people share and engage with it, often reaching many times your usual audience.
- BlockBlocking on X stops an account following you, engaging with your posts or messaging you. If your posts are public, they can still see them.
- BioYour X bio is the short description under your name on your profile, up to 160 characters. It tells visitors who you are and why to follow.
- CTAA CTA, or call to action, is the line that tells readers what to do next, such as follow, reply, bookmark or click a link.
- DMA DM is a private message on X. X now calls its messaging Chat, with encrypted messages, voice and video calls and settings for who can reach you.
- HandleYour handle is your @username on X, the unique name people use to mention you. It holds letters, numbers and underscores, up to 15 characters.
- HashtagA hashtag is a word or phrase after a # sign that groups posts on one topic. X suggests using no more than two per post.
- HookA hook is the opening line of a post or thread, written to stop the scroll and make people read on. It decides whether the rest gets seen.
- LikeA like is the heart under a post on X. It shows appreciation in one tap, and since June 2024 the posts you like are private to you.
- MentionA mention is a post that includes someone's @handle on X. The person is notified, and the post links to their profile.
- NicheYour niche is the focused topic and audience your X account serves, such as SaaS pricing for founders. A clear niche makes growth faster.
- Pinned postA pinned post is one of your own posts fixed to the top of your X profile, so every visitor sees it first. Use it for your best work or offer.
- Quote postA quote post shares someone else's post on X with your own comment on top, so your followers see the original and your take together.
- Reply guyA reply guy is someone who replies to posts on X constantly. Done well, it is a fast way to grow. Done badly, it reads as spam or unwanted attention.
- ReplyA reply is a post written in response to another post on X. It joins the conversation under the original and is one of the fastest ways to grow.
- RepostA repost shares someone's post with your followers exactly as it is. It was called a retweet before Twitter became X.
- ShadowbanA shadowban is when X quietly limits who sees your posts without telling you. X calls it visibility filtering. Here is how to check and recover.
- Swipe fileA swipe file is a saved collection of posts, hooks and ads that worked, kept as inspiration for structure and style when you write your own.
- ThreadA thread is a series of connected posts on X from one author, read top to bottom, used to tell a longer story or teach a topic step by step.
- Alt textAlt text is a written description of an image on X, read by screen readers and shown under the ALT badge. X allows up to 1,000 characters.
- Engagement farmingEngagement farming is posting bait like "like if you agree" or rage bait to collect likes and replies cheaply. It inflates numbers and erodes trust.
- Engagement rateEngagement rate on X is engagements divided by impressions, times 100. It shows what share of people who saw a post acted on it.
- GhostwritingGhostwriting on X means someone else writes posts that publish under your name. Common among founders and executives, it has trade-offs to weigh.
- GrokGrok is xAI's AI assistant built into X. You can chat with it from the sidebar or tag @grok in a reply to ask about a post.
- Following feedThe Following feed on X shows posts only from accounts you follow, so you can keep up with the people you chose.
- For You feedThe For You feed is X's recommended timeline. It mixes posts from accounts you follow with posts X predicts you will enjoy.
- AlgorithmThe X algorithm decides which posts appear in your For You feed. It predicts how likely you are to engage with each post and ranks them.
- X PremiumX Premium is X's paid subscription for the blue checkmark, fewer ads and creator tools. New buyers now get it through The X Subscription.
- Creator revenue sharingCreator Revenue Sharing paid X creators a share of ad revenue. X retired it in September 2026 and replaced it with Original Content Rewards.
This glossary explains the words people use on X, from platform features like Community Notes, the For You feed and X Premium to creator slang like reply guy, ratio and build in public. Each entry gives a short definition, an example and why the term matters if you want to grow on X.
Facts about X features were last checked in November 2026 and link to their sources on each page.
Start here
- Growing an account: algorithm, impressions, engagement rate, virality, niche.
- Writing posts: hook, thread, CTA, swipe file, build in public.
- Joining conversations: reply, reply guy, quote post, ratio, mention.
- Platform features: X Premium, Community Notes, For You feed, Grok, Spaces.
- Staying safe: shadowban, engagement farming, mute, block.
For the hard numbers behind these terms, such as character limits, image sizes and daily posting caps, see the X specs hub.