Spending hours on TikTok? Here’s how the app keeps you swiping.

An interactive data project by The Washington Post that created an 800-person reader sample to monitor TikTok interaction data

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So The Washington Post, through an unprecedented partnership with our readers, collected TikTok watch histories from 1,100 users. We created a database of roughly 15 million videos served up to them in a six-month period last year. Our analyses showed just how effective TikTok is at getting even its heaviest users to swipe more and watch more on its platform.