Is there a way to prevent trolls? Not really. Trolls are not necessarily always made by the anonymous monk, since anyone can make a dud user. Is it a big deal? Not really. i think a multitude of great questions are posed at perlmonks.org, and a little wit once and again never killed anyone. i can imagine that it could very easily escalate into a pollution problem- quite possibly unpreventable and unfilterable. just take the trolls with a grain of salt and ignore them. And remember, wasting -- on an anonymous or dud monk is just a waste of your own vote where it may be more fitting elsewhere.