Someone who goes onto an opposition website or forum with the express intention of causing furore for their own gratification

Noun, A fake lurker, someone who comes into a Twitch channel with only the intention to watch the stream but ends up chatting with everyone.

Originally occurred in Gabriel & Dresden's stream where a user came in for the music but ended up chatting, he was called out as a fake lurker, a flurker, and Dave called him out and made the word famous. It has drifted to other rooms since.

Also, noun flurk - someone who is a fake lurker,
adj. flurking - the act of being a fake lurker, and
verb. flurked - having been a fake lurker.

A Facebook lurker. Somebody who will like all your statuses and comment on all your photos. Shady character, possibly slightly mentally unhinged.

Someone who sits in a chat channel, usually a sexual one not talking. They are a flurker. They are said to be fapping and lurking at the same time. So a flurker.