What used to be called bullying or leg pulling is now officially referred to as trolling — although trolls have existed long before online communities came into being. However, trolling has become quite popular in recent years. A research team at the University of Manitoba published a paper called, “Trolls Just Want to Have Fun”. It discussed the connection between personality disorders and online trolling activity in detail.

Source : https://brightside.me/wonder-curiosities/19-people-who-are-so-good-at-trolling-hardly-anyone-can-beat-them-595460/