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Write-Time vs Read-Time Fan-Out: How Social Feeds Scale

TLDR: Fan-out is the act of distributing one post to many followers' feeds. Write-time fan-out (push) pre-computes feeds at post time β€” fast reads but catastrophic write amplification for celebrities. Read-time fan-out (pull) computes feeds on demand...

Mar 29, 2026β€’19 min read

Abstract Algorithms

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