noun
a person who engages in such behavior
verb
to antagonize or harass others online for one's own amusement
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The online forum had to implement strict moderation to prevent trolls from disrupting discussions.
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I can't believe that troll keeps posting rude comments on social media.
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That troll is always stirring up drama for attention.
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Ignoring the troll under the bridge is the best way to avoid conflict.