X launched Grok-curated Custom Timelines for Premium subscribers on iOS this week and confirmed that Communities will shut down on May 6. Roughly 75 pre-built topics can now be pinned to the home tab, with Grok labeling every post in the network so feeds personalize per user.

What Happened

The Custom Timelines rollout went live for iOS Premium subscribers around April 21. Each user can pin a set of topic feeds to the home tab and switch between them, with the Grok model reading every post, generating topic labels, and ranking content for relevance rather than relying on keywords or hashtags. A new Snooze Topics control lets users mute themes they want out of the algorithm.

Two days later, X confirmed that Communities will be retired on May 6. Head of product Nikita Bier said the feature was used by under 0.4% of users but generated 80% of spam reports, scams, and malware on the platform. Group conversations are migrating to XChat, which now supports public joinable links for groups of up to 350 people.

Why It Matters

For creators and brands, the shift moves discovery further away from human-curated spaces and into algorithmic surfaces. Communities had functioned as opt-in distribution channels: post once inside a niche group, reach a self-selected audience. Custom Timelines replace that with a model where Grok decides which posts surface in any given user's pinned topic feed, and the same release adds new ad slots inside those feeds.

The practical impact for AI creators, designers, and indie tool builders is that targeted distribution no longer comes from joining the right Community. It comes from posting content the model classifies into the topic a user has pinned. Topic-tag signals, on-platform engagement, and prompt-style metadata now matter more than community membership.

Key Details

  • Custom Timelines launch: April 21, Premium iOS subscribers, Android rollout planned next.
  • Topic count: Roughly 75 pre-built topics at launch, pin and reorder on the home tab.
  • Grok role: Reads every post, assigns topic labels, ranks for individual user relevance.
  • Snooze Topics: Per-topic mute control to suppress themes from the feed.
  • Communities shutdown: May 6, 2026; admins have a two-week window to migrate.
  • Replacement for groups: XChat public group links, capacity 350 people.
  • Monetization: New ad slots embedded inside Custom Timelines.

What to Do Next

If you run an AI Community on X, export member usernames and announcement history this week. Create an XChat group, generate a public join link, and pin it to your Community page before May 6 so existing members have a clear migration path. Posting frequency in the new feeds will also matter: the algorithm needs enough signal to classify your content into the right topics.

For brands and indie product accounts, audit your last 30 days of posts and check which topics they would map to. The Custom Timelines surface rewards posts with clear topical clarity, so prompt-and-output threads, product launches, and specific tool walkthroughs will be easier for Grok to label than generic commentary.