Design a real-time feed system at Twitter or news aggregator scale with push, pull, and hybrid fanout strategies, ranking algorithms, celebrity user handling, and feed delivery optimization for 500M+ daily active users.
## CONTEXT Real-time feed systems represent the most complex pure-software architecture problem in consumer internet at scale, with Twitter (now X), Facebook, Instagram, TikTok, and major news aggregators each running custom feed infrastructure handling hundreds of millions of daily active users and producing tens of…
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