I havn't made any videos for youtube but if I did I would just disable all comments.... a lot of it's spam and some of the comments really beg belief. Youtube comments make even the stupidest of bash quotes look intelligent.
All that sort of stuff like 'go to my referal site', 'public service announcement', 'Chinese eat horrible stuff, 'save the whales or whatever' are bad enough but the chain letters really make you laugh:
'hi i am a boy named teddy i am 7 years old and i have scary eyes and no ears or nose if u do not send this to 15 people i will arrive in ur room tonight and i will bring my knife n stab u to death this is not a joke if u send this to 15 videos before u go to bed something good will happen either u will get asked out on the computer or someone will say that they luv u or they will call u at 10:22 u can not send this to me'
*sigh*