Can’t make my mind up about this web site, Perverted Justice. There was an article about it on Salon.com (but it’s premium, so the link wouldn’t work here), and it’s basically a site where vigilante types go to chatrooms and pose as underage boys and girls. When they’re approached, they try to get as much information about the would-be pedophile that they can, then reveal their identities and post the whole session on this site. They’re not cops, but they hope to discourage this kind of trolling for kids on the internet. I don’t know whether it works – apparently people find would-be pedophiles on this site and harrass them, too. It’s an interesting approach, I suppose.