It's also possible that the videos you do watch are similar to people who _also_ watch those pimple popping vidoes, and so the algorithm guesses that you might also enjoy it.
Maybe, in which case I'd be interested to see where the cross-over is.
Though I've had them come up on facebook too, which is why I'm erring on it being someone more actively engaged coming from my main IP address (home has had the same /29 for the last 10+ years). Unless youtube and facebook are fairly directly sharing information, I thought it more likely that someone has interacted with such content in both places than both algorithms making an obscure link. Of course, it could be that there is a cross-over, and it is a strong enough signal that both sets of data miners have picked up on it.
Edit: too early in the morning and my mind is refusing to switch tracks… Thinking about it, liking certain horror/scifi films is a potential link. Maybe people more heavily into body-horror than I are generally fascinated by real aspects of bodily function too.
