Twitter's Fanout Strategy at Scale: The Trade-Off Most Designs Miss

Book: System Design Pocket Guide: Interviews Also by me: Database Playbook My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub Imagine a top-followed account posts a tweet. Call it 100M followers, roughly the order of the largest accounts on X today. If you fanned that tweet out to every follower's home timeline at write time, you'd execute 100M list-prepends in the few seconds the post takes to render, and your wr