Design a News Feed
Hard · System Design · about 45 minutes
Asked at ByteDance, LinkedIn, Meta, Microsoft, Pinterest, Reddit, Snap, X (Twitter), Zillow, Discord, Duolingo, Grammarly, Yelp, Quora, Match Group.
Design a social news feed. Users follow other users and see a reverse-chronological feed of posts from people they follow. Some users have tens of millions of followers. Feed loads must be fast (<200ms).