Lawsuits from youtubing?

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So you constantly hear how people don't like file sharing sites and what not and how shows don't like it when they get broadcasted online on a site like alluc.org and what not and over all its just because they aren't getting ad revenue for it. Well with youtube there are a ton of shows they get posted - same goes with music videos etc. - and I was wondering if anyone had heard of a user getting sued for it. I mean they are taking copyrighted material and putting it on the web without permission, so that makes me wonder if action was taken or was it just a oh we're just going to delete your video/account.