This theory states that a normal person plus anonymity plus an audience equals total @#$%wad. This theory deserves a great deal of credence because these virtual worlds remove any repercussions for a person’s actions that person feels no great need to follow the social norms set out in the actual world. I feel that the separation created by the computers also contributes to this effect. As not only are you entirely anonymous but the person to whom you are being so very terrible is represented as nothing more than a collection of pixels and is not another human being standing next to you. We may be feel sympathy for out fellow humans on whose faces we can read the emotional effects of our statements but rarely so for pixels on a face animated to do no such thing.
From this we could assume that everyone on the internet is going to be a terrible person but this is rarely the case for example the very site which provides this pessimistic theory also created the charity Child’s Play which donates millions of dollars every year to buying games and toys for hospitals. Evidence can easily be found of people on the internet being wonderful and being horrible, even of them achieving wonderful things in horrible fashion but all in all I think people on the internet are really the same as people in the real world, just with the lowered inhibitions that come with anonymity.
The link to the original comic is: http://www.penny-arcade.com/comic/2004/3/19/
The comic in the article is from xkcd at: http://xkcd.com/438/
For the evidence I discuss in the last bit see: http://www.cracked.com/article_17170_8-awesome-cases-internet-vigilantism.html