TikTok's app is the result of designing an app around a recommendation algorithm (instead of adding recommendations to an app, as everyone else did). As a result you get great recommendations. I imagine that also really helps with moderation and censorship: Identify videos you want to restrict, check which cohort gets recommended those the most, then concentrate your moderation efforts on videos that the algorithm wants to recommend these people.
The recommendations and people's video interactions allow you to classify both people and videos.
The recommendations and people's video interactions allow you to classify both people and videos.