In Internet slang, a troll (pron.: /ˈtroʊl/, /ˈtrɒl/) is someone who posts inflammatory,extraneous, or off-topic messages in an online community, such as a forum, chat room, or blog, with the primary intent of provoking readers into anemotional response or of otherwise disrupting normal on-topic discussion. The noun troll may also refer to the provocative message itself, as in: "That was an excellent troll you posted."
a troll basically likes to just start a fight verbally but then may ignore any ensuing disputes caused by their controversial topic. A bully continues with the argument they started inciting maybe a mob mentality or physical violence/threats.
OMG ENOUGH ALREADY! Get a Grip! Get a hobby or something! Pay more attention to your family instead of annoying everyone online.
lol. A bully is saying something to try and make someone intentionally mad or try purposely to hurt someones feelings. Troll is someone who just bullshits basically just to see other people's reactions.