http://en.wikipedia.org/wiki/Troll_%28Internet%29
Thanks, is there a term for someone with a wikipedia phobia?
Nope. You'll need to overcome that phobia if you ever want to learn anything. Here I'll copy and paste the first line of the article for you:
In Internet slang, a troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking other users into a desired emotional response or of otherwise disrupting normal on-topic discussion.
Basically, a troll just tries to get attention from a given community by posting something scandalous, shocking, annoying, stupid, or otherwise emotion-invoking.