Well, I think we've plenty of proof all around us that idiots abound. And, certainly the internet gives them plenty of room to showcase their idiocy. I think it's fair to note, however, that it would also have plenty of potential to induce a sort of "mob mentality", which has been proven to reduce the effective IQ of everyone in the mob by an average of 10 IQ points.
As an example, were I to go onto an ordinary, run of the mill forum, and announce that Bush is a genius, I like Sarah Palin's tits, and anyone who doesn't recognize the supremacy of the xtian god is an unrepentant sinner moron who should be crushed, killed and allowed to burn in hell, it is extremely likely that the average IQ of the forum members would plumment abysmally, until most of them quit making sense all together. Of course here it would eventually result in a conversation about omlettes, which does make a lot of very good sense, but I think we can all agree this is not an average forum.