An internet troll is someone who anonymously posts comments on a website that are either unrelated or purposefully designed to incite strong emotions in the reader.
- Troll (Internet) @ Wikipedia
Excerpt: In Internet slang, a troll is a person who sows discord on the Internet by starting arguments or upsetting people, by posting inflammatory, extraneous, or off-topic messages in an online community (such as a forum, chat room, or blog), either accidentally or with the deliberate intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.
- Internet Troll @ Urban Dictionary
Excerpt: A person whose sole purpose in life is to seek out people to argue with on the internet over extremely trivial issues. Such arguments can happen on blogs, Facebook, Myspace and a host of others. The best thing you can do to fight an internet troll is to not answer…or report them.