xAI Updates: April 23, 2026

1. X Replaces Communities With Grok-Curated Custom Feeds

xAI. X’s AI-powered custom timelines are rolling out as the replacement for Communities, with Grok doing the per-feed curation and new ad slots injected into the stream. Users describe a topic in natural language and Grok assembles a feed that behaves like an algorithmic list — ranking posts against the described interest rather than following a fixed member roster. The change retires the Communities product in favor of a model-driven timeline that Grok personalizes per user, while also opening a new inventory surface for X’s ad business. Source