Design a News Feed – Defend

Interviewers may push:

• "What if a user follows 10M people?"
  Push would be impractical. Use pull or hybrid; consider ranking/sampling.

• "How do you handle spikes?"
  Cache aggressively, queue writes, auto-scale read replicas.

• "What about real-time?"
  Add a notification/push layer; WebSockets or long polling for live updates.

Inline Check 1

How would you adapt your design if the interviewer says "Assume 100M DAU"?

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