Elon Musk just announced two changes to X's recommendation algorithm, and they could affect what shows up in your For You feed. Instead of relying primarily on familiar engagement signals such as likes, reposts and replies, X is improving its ability to predict which posts will hold your attention and which ones you'll actually finish reading.

In an Monday post, Musk outlined two updates: a new AI ranking model that better predicts how long someone is likely to spend viewing a post, and a retrieval model trained to find posts people read all the way through.

Two important changes to timeline recommendations:- New AI/SI ranking model that predicts probable time spent much better- Retrieval model trained to surface posts people read all the way throughUser active seconds is growing exponentially and hitting all-time highs almost every day:October 20, 2026

X already uses AI to determine which posts appear in your For You feed. According to the company's published recommendation algorithm, the system pulls posts from accounts you follow and accounts you don't, then uses a model to predict how you're likely to interact with each one.

Those predictions include actions such as liking, replying, reposting and spending time viewing a post. So tracking attention isn't entirely new. The first update that involves the way X uses that information is that the model will get better at predicting how long someone will spend on a particular post.

So, that means, if you're scrolling past two posts about the same breaking news story, the one that has more likes isn't necessarily the one people will read.

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