Design comment ranking for a news feed

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Design the ML system that decides which comments to show, and in what order, under posts in a news feed.

Discuss the objective (meaningful conversations, not only likes), the labels, features of the comment, its author and the viewer, demoting low-quality or harmful comments, freshness on fast-moving posts, serving latency, and how you would measure success.

MetaML designLast asked Dec 2025
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