I think it's funny that both of those sites seems to get represented by a more vocal and publicly visible subset of their users, and in 4chan's case by a slightly unfair-seeming set of associations between anyone using the term "Anonymous" (despite the fact that Anonymous is simply a name that one can take up without it implying any real link to a group), the one board out of many that is apparently implicated in anything "Anonymous" does, and the site as a whole.