"Design a newsfeed app like Twitter or Instagram."
Analyzing the Problem
Twitter and Instagram are newsfeed apps: an infinite, ranked feed of mixed text, image, and video posts that the user scrolls, pages forward through without duplicating or skipping a post, reads offline from cache, taps to like or save with the action surviving offline and retries, pulls to refresh for new posts without losing the reading position, and watches the most-visible video autoplay while the rest stay paused. What to show is the ranking model's call, and that runs server-side - your canvas starts at the feed API.
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