From the urban dictionary -
An Internet troll, or simply troll in Internet slang, is someone who posts controversial, inflammatory, irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the primary intent of provoking other users into an emotional response or to generally disrupt normal on-topic discussion.
I wish the troll, a Harry Potter impersonator comes back to Funadvice. He or she has the most hilarious sense of humour and their answers to status and questions are always Harry Potter related.
oh ok thanks!