Yes, "Trolls" can be a serious issue, apparently they have hives and secret groups in the internet land. My first experience with "Trolls" was when I used to frequent a usenet group for the Jethro Tull band.
Trolls moved in with the sole intention of destroying and taking over that forum. They did. The thing that surprises me is that, to this very day, they still occupy that forum. It has to be a full time concern for them to spread so much hate. They have been there now for three or four years.
Visit alt-music jethro tull if you wanna see real trolls in action. I'd advise highly though that you just don't mess with them, you will never win.
