Traits of a Troll: Research Reveals Motives of Internet Trolling

Individuals with dark triad personality traits, including narcissism, Machiavellianism, and psychopathy, combined with feeling schadenfreude, taking pleasure from the misfortune of others, are more likely to indulge in internet trolling.
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Troll - TV Tropes

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Is Online Trolling a Reflection of Our Social Values?