From the comments

You know the weirdest thing is that I've found an even worse disturbing culture on google+ because it seems to not be as regulated as facebook? Pedophiles in plain sight commenting on little boys' and girls' pictures, getting together in a group and "rating" them or straight up on their profile, then when confronted they would not stop going on about how this is normal, how they've always knew they were sexual since little boys so these kids must know too, consent should be at a younger age, pedophilia will be legalized like lgbt is.... so much shit.. the weirdest thing is that reporting them does nothing. Google doesn't care. There's a whole hive of pedos on google+ it's really disturbing.

Then oh my lord the private groups on facebook... fortunately on facebook they get taken down fast if someone finds out about them but it's difficult to find your way into a private group, where facebook doesn't consider 1 report strong enough to yield consequences or to be taken down.

So really there are bigger pedophilic cultures on google+ and facebook than on YouTube. YouTube is just another tool for their entertainment. The real gathering is on social media..