http://www.futurity.org/internet-trolls-1352992-2/
"Internet trolls, by definition, are disruptive, combative, and often unpleasant with their offensive or provocative online posts designed to disturb and upset.
The common assumption is that people who troll are different from the rest of us, giving us the freedom to dismiss them and their behavior. But a new study suggests otherwise—under the right circumstances, anyone can become a troll.
“We wanted to understand why trolling is so prevalent today,” says Justin Cheng, a computer science researcher at Stanford University and lead author of the new paper. “While the common knowledge is that trolls are particularly sociopathic individuals that occasionally appear in conversations, is it really just these people who are trolling others?”"
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