This is the applicable definition of a troll...
In slang, a troll is a person who posts or makes inflammatory, insincere, digressive, extraneous, or off-topic messages online, or in real life, with the intent of provoking others into displaying emotional responses, or manipulating others' perception, thus acting as a bully or a provocateur.
Doesn't fit. And for Christ's sake, as far as inflammatory, read some of the Joker's personally fueled rants. I don't post anything even remotely close to that vitriol.