Internet trolls are becoming more prevalent. While those hideous, green creatures featured in fairy tales usually lie in wait for victims under bridges, internet trolls lurk on discussion and other sites and typically engage in some kind of ad hominem attack against the site or individuals posting there. The attacks are contrary, nasty and designed to elicit some kind of response.
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There are two good ways to deal with trolls: either ban them from the site outright or totally ignore them, because responding to their taunts is exactly what they want you to do. In rare cases, an organised group response of some kind can work, especially if the troll's real identity can be determined. Since trolls are looking for a fight, a random compliment can often throw them off. But do be aware that what may appear at first to be a troll could just be someone with strong opinions on a particular subject. A true troll will launch an attack no matter what the subject and won't stop even if asked to tone down his comments.