What's the psychology behind Trolling/Flaming?

Question

For those new to the internet, trolling is an activity were one person intentionally tries to upset other members of the same community, presumably for entertainment.

This has been informally addressed in the media, normally positing that the anonymity of the internet gives rise to more extreme behaviors,

• but is that the explanation research supports?
• And if it is, how does the process of enabling occur?
• And more broadly, why do people derive pleasure from the anger of others within the same group?
• Lastly, is this behavioral phenomenon unique to the internet era, or are there historical predecessors involving similar causal mechanisms?

Answer 1

There are a few references to the scientific literature on trolling in the wikipedia article

Some psychologists have suggested that flaming would be caused by deindividuation or decreased self-evaluation: the anonymity of online postings would lead to disinhibition amongst individuals (Kiesler et al, 1984). Others have suggested that although flaming and trolling is often unpleasant, it may be a form of normative behavior that expresses the social identity of a certain user group (Lea et al, 1992; Postmes et al, 1998).

References

• Kiesler, S. , J. Siegel and T.W. McGuire (1984). "Social psychological aspects of computer-mediated communication". American Psychologist 39 (10): 1123–1134. doi:10.1037/0003-066X.39.10.1123. LINK
• Lea, M., T. O'Shea, P. Fung and R. Spears (1992). "'Flaming' in Computer-Mediated Communication: observation, explanations, implications". Contexts of Computer-Mediated Communication: 89–112.
• Postmes, T., Spears, R., & Lea, M. (1998). "Breaching or building social boundaries? SIDE-effects of computer-mediated communication". Communication Research (25): 689–715. FREE PDF

Answer 2

From an article by the NY times.

Trolling, defined as the act of posting inflammatory, derogatory or provocative messages in public forums, is a problem as old as the Internet itself, although its roots go much farther back. Even in the fourth century B.C., Plato touched upon the subject of anonymity and morality in his parable of the ring of Gyges.

...

Psychological research has proven again and again that anonymity increases unethical behavior. Road rage bubbles up in the relative anonymity of one’s car. And in the online world, which can offer total anonymity, the effect is even more pronounced. People — even ordinary, good people — often change their behavior in radical ways. There’s even a term for it: the online disinhibition effect.

Answer 3

Here is an article explaining trolling based on Sperber and Mercier's "argumentative theory" of human reasoning. The latter is a fascinating paper in its own right.

References

• Mercier, H. and Sperber, D. (2011). Why do humans reason? arguments for an argumentative theory. Behavioral and Brain Sciences, 34(02):57-74. FREE PDF