hardSystem Design

How would you design a news feed system?

Q: How would you design a news feed system?

## News feed A news feed is a generalization of the Twitter timeline with one big addition: the feed is usually **ranked**, not purely chronological. Two concerns: **feed generation** (gathering candidate posts) and **ranking** (ordering them). Generation uses the same **fan-out** trade-off (push/pull/hybrid). Ranking then scores each candidate post and returns the top N: Candidates (from follows) Rankin

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