Twitter's Timeline Architecture
How Twitter assembles and delivers the home timeline. Shows the fanout-on-write approach where tweets are pre-computed into Redis caches per user, ML-powered ranking for the algorithmic timeline, Social Graph on FlockDB, media service with CDN delivery, and ads injection.
general · architecture diagram.
How Twitter assembles and delivers the home timeline. Shows the fanout-on-write approach where tweets are pre-computed into Redis caches per user, ML-powered ranking for the algorithmic timeline, Social Graph on FlockDB, media service with CDN delivery, and ads injection.
Created by
February 9, 2026
Updated
February 13, 2026 at 5:47 PM
Type
architecture
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