System design interview question
"Design the Facebook News Feed. A user opens the app and sees posts from friends, pages they follow, and groups they are in — not in time order, but ranked by what they are most likely to engage with. 2 billion daily users."
This is not Twitter. The distinguishing feature is ranking, and ranking inverts the architecture: you can no longer precompute the final feed, because the ranking model's output depends on features that change by the minute. The candidate must discover the candidate generation → feature hydration → ranking → filtering pipeline.
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