How TikTok and YouTube decide what you see next
Ranking: how a video feed decides which video comes first
A video app has a short list of a few hundred videos for you. Only one can play next. The app gives each video a score. What does that score try to guess about you?
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Now comes the careful step. A second program takes the candidates one by one and gives each of them a score. The highest score goes first.
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Take two of them: a new pottery video by Miva, and a video about bees. Neither is good or bad in itself. So what could the score measure?
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