An internet troll is someone who comes into a discussion and posts comments designed to upset or disrupt the conversation. Often, it seems like there is no real purpose behind their comments except to upset everyone else involved. Trolls will lie, exaggerate, and offend to get a response. What kind of person would do this? Canadian researchers decided to find out. They conducted two internet studies with over 1,200 people. They gave personality tests to each subject along with a survey about their internet commenting behavior. They were looking for evidence that linked trolling with the Dark Tetrad of personality: narcissism, Machiavellianism, psychopathy, and sadistic personality.