When I first read the title I was quite tired and thought this was about smart youtube comments and I thought there wouldn't be much content available for the thread.
depending on which videos you read the comments you might be in for a surprise. for instance,
scishow's and
skallagrim's commenters regularly have above average discussions, except for the occasionnal trolls, but that's to be expected, seeing as one regularly defies bigoted points of view and the other knocks katana-weeaboos. same deal with
scholagladiatoria, where history buffs meet mall ninjas.