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.
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 trolls can only be totally defeated through the use of fire of acid, substances that are woefully scarce in cyberspace, there is no way to actually destroy them at this moment. 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)