I gotta agree. Youtube is a good way to trade videos and such, but I like to at least know what I'm going to be watching.
PARTICULARLY if I click on a link at work. If it pulls up a scene from C-SPAN or something like that - all fine and dandy. A girl in a bikini firing an M16? Not so great if someone walks in.
Even aside from Youtube, pretty much any post that is just a link with an accompanying "Look at this" or "this makes me made" tag I'm not going to bother reading/watching.