This long essay on Trolls (or Conversation Hacking) is quite fun.
“… people rarely refrain from biting on Steve’s baits. He relished every minute of the argument …There you may find the antique equivalent of Trolls : what people at the time called ‘sophists’ or ‘philosophers’ – two words that were used interchangeably by the man on the Forum. Many Sophists did not want to endorse the label – sophistry was frowned upon or downright illegal in many places – and insisted on being called Philosophers
To quote our informant again: “those who do not know about trolling troll unconsciously”. …”