The greatest video sharing community on the web. It has many gifted people who make amazing things in their videos.
There're some ungifted that scam you when sending you private messages but you should always ignore them.
1- YouTubes greatest failing is its commenting system. While all are free to make a comment on a video, most use it as a vehicle for argument and antagonism. More often than not resulting in racist, homophobic and down right hateful remarks.
2- The "thumbs" issue... Pure SPAM generator..