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TikTok explains how the recommendation system behind its For You feed works

Open up short-form video app TikTok and youre met with a stream of popular videos, tailored to your own interests. But when your friend launches TikTok on their own phone, theyll see something different. TikTok calls this main stream of content the For You feed because of how its personalized to the individual user. But how the recommendation system worked behind the scenes was something of an unknown until now. Today, the company detailed the factors that contribute to the For You feed, as well as how theyre weighted for each individual user.
It also explains what its doing to ensure the system isnt creating filter bubbles that is, a feed where youre presented with a homogeneous stream of videos.
Like many recommendation systems, TikToks For You feed is powered by user input.
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