X (Twitter) Algorithm Update Timeline 2026

Grok reads every post's text, watches every attached video, and personalizes predictions in real time based on user history and engagement. Both the For You and Following feeds are Grok-ranked (the Following feed used to be reverse-chronological). The system heavily weights engagement quality: a reply that gets a reply from the author is worth roughly 150× a like, a retweet is worth ~20× a like, a bookmark is worth ~10× a like.

Ranked by weight: replies that spark further conversation (150× a like), retweets (20×), bookmarks (10×), likes (baseline). Bookmarks are notably strong in 2026, they signal that content is worth saving for later reference, which Grok interprets as high-value. For practice owners, reference threads and framework posts (things people bookmark for later) compound reach better than one-off promotional posts.

Grok interprets bookmarks as a strong 'save-worthy' signal, content valuable enough that the viewer wants to return to it. For healthcare and behavioral health accounts, this shifts strategy: reference threads (e.g. 'what to know about IOP admissions'), symptom-to-decision flowcharts, and framework posts save-out at high rates and get pushed to broader audiences. Straight promotional posts and daily quips underperform relative to reference-quality content.

Both are Grok-ranked. The Following feed is filtered to accounts you follow but ordered by predicted engagement, not chronology. The For You feed pulls from the entire graph. In July 2026 X added a mutual-follower boost that surfaces more posts from accounts you follow who also follow you back, especially in reply threads. For B2B practice owners: replying to peers who follow you back builds compounding visibility.

For practitioners, mostly not directly, the code is dense and evolving. But the release confirms things we can act on: originality signals matter (Grok detects near-duplicates), video content is weighted heavily (Grok watches it, not just captions), and account-quality signals (post frequency, follower ratio, complete profile) still gate reach. The public release removes ambiguity from what's a ranking signal and what isn't.

We track blog.x.com, X Engineering, the public github.com/xai-org/x-algorithm repository, Nikita Bier's product updates, and industry-side coverage from Social Media Today and Sprout Social. New confirmed X changes are appended to this timeline every 3 days.