X Algorithm: Writing Posts That Get Ranked A single source of truth for writing on X, derived directly from the open-sourced For You algorithm. No folklore, no growth-hack myths — only what the actual ranker, retrieval system, and content classifiers reward or punish. How the Feed Actually Works Every For You impression is the output of this pipeline: Two ways into a user's feed: 1. Thunder (in-network) — they follow you. Sub-millisecond lookup. Always preferred. 2. Phoenix retrieval (out-of-network) — a two-tower model embeds your post and the user's engagement history into the same space, t…