Design Studio — Design a Social Media Feed (Twitter/X)
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Requirements
Scale & non-functional
- 300M DAU, 500M tweets posted per day ≈ 5,800 writes/sec
- Timeline reads: each DAU loads feed ~5 times/day → 1.5B reads/day ≈ 17,400 reads/sec
- 99.99% availability — feed must degrade gracefully, never go fully dark
- Timeline load latency < 100ms at p99
- Eventual consistency is acceptable — a tweet may appear in follower feeds within a few seconds
- Media (images, video) served within 2s globally via CDN
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