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I would assume it's time spent on video and they start to build a profile of which users like what kind of content. X liked video 934934 so Y probably also like
by cactusplant7374 9mo ago
I would assume it's time spent on video and they start to build a profile of which users like what kind of content. X liked video 934934 so Y probably also likes that kind of video. Group people in buckets.
- permo-w 9mo agoI'm sure this is part of it, but I suspect it goes deeper than that. I'd guess they probably have some kind automated categorisation algorithm that can extract features from the videos