Design the news feed system for a social media platform like Twitter or Instagram. **Functional Requirements:** - Users can create posts (text, images, videos) - Users see a feed of posts from people they follow - Feed is ranked by relevance (not just chronological) - Support for likes, comments, and shares - Real-time feed updates when new posts are created **Non-Functional Requirements:** - Feed generation should be fast (< 200ms) - Support for celebrities with millions of followers - Eventually consistent (new posts appear within seconds) **Scale:** - 500M users, average 200 follows each - 1M new posts per day - Feed is the most accessed feature (~10B feed loads/day)

Social Media News Feed

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Design the news feed system for a social media platform like Twitter or Instagram.

How would you handle trending/viral posts that should appear in many feeds?
How would you implement 'Suggested Posts' from accounts the user doesn't follow?
How would you handle feed pagination and ensuring no missed posts?

Functional Requirements

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Non-Functional Requirements

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