Troll
A troll is a person who post inflammatory comments to try and start a fight on the internet.
They are to be given a rating on a scale of 10, based on how subtle they are in their trolling, if it's an amusing troll, and general quality of their post. This type of contentless post can also be a troll.
e.g.
"Hey gaiz, 4e lolololol" merits 0/10
There are no examples of a 10/10 at this time, as trolls are usually children who aren't intelligent enough to post quality material.
As most species of troll can only be totally defeated through the use of fire or acid, many internet users assume this will be true of the Internet troll, however the Internet troll is a Min-Maxing Powergaming Wanker, and always has some combination of templates and one-level PrC dips to make it immune to Flaming attacks, or worse still is able to feed off them and increase its Trolling ability. This is the reason 3 trolls seem to pop back up and start three more worthless RAGE thread for every one that is defeated by logic or sage, neither of which are listed as doing fire or acid damage in the DMG or PHB.