It is just selecting users based on the videos you have watched. It isnt global popularity ranking, rather its ranking amongst users who also watch your videos.

It is just selecting users based on the videos you have watched. It isnt global popularity ranking, rather its ranking amongst users who also watch your videos. Your watching a video is only a weak correlate of your preference. If I were recomemnding you something, I wouldnt ask you -- literally -- what specific videos you watch. I'd ask for your (real) preferences: are you bored right now? Do you want somerthing exiting? What's your mood? etc. etc.