A document from TikTok's engineering team in Beijing details the product's addictive algorithm, which optimizes for "retention" and "time spent" (Ben Smith/New York Times)

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Ben Smith / New York Times:
A document from TikTok's engineering team in Beijing details the product's addictive algorithm, which optimizes for “retention” and “time spent”  —  It's the most successful video app in the world.  Our columnist has obtained an internal company document that offers …

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