X Communities
Also known as: X Community, Twitter Community
Topic-based groups inside X where members post to a shared feed visible only to the community — replaced the older "Twitter Circle" feature.
In depth
X Communities are persistent topical groups (formerly known as Twitter Circles, now substantially different in design). Members post to the community feed; non-members can't see those posts. Useful for niche conversation that doesn't belong on the main timeline.
Each community has a moderator who admits members and sets rules. Popular communities include developer groups (AI engineers, indie hackers), creator economy networks, and industry-specific spaces (real estate, finance).
From a growth angle, posting in active communities can drive more meaningful engagement than the main feed because the audience is pre-filtered for your topic. Some creators use Communities as a staging ground for content before posting publicly.
Example
The AI Builders community on X has ~80K members; a thoughtful post there can outperform a 5,000-follower account's public timeline reach.
Related terms
X List
A curated collection of accounts that you can follow as a separate timeline.
Niche
The specific topic or audience an X account focuses on.
Mutuals
Accounts that follow you while you follow them back — a mutual-follow relationship.
X Spaces
Live audio rooms hosted on X, where any user can speak or listen.
Now put it to work
AutoTweet generates and schedules X content tuned for the algorithm — the same one this glossary just explained.