If you're looking to expose a cheater — or just to read some sordid tales — then head to cheaterville.com. Since its launch on Valentine's Day this year, the site has attracted millions of viewers who search for cheats by name and location, and who anonymously upload their own infidelity stories, including full names and photos of the accused. This summer, Cheaterville continues its crusade against the monogamously challenged with the launch of iPhone and Android apps. So if you spot your best friend's husband making out with another woman at the bar, you can click on the app to take a photo and instantly upload the cheater's antics. Then you can send an anonymous e-mail to notify your friend.

Chief executive James McGibney says he isn't concerned about defamation suits. "We're no different than Facebook. When a person posts there, they are liable for that post, not Facebook," he says. He adds, "About three cheaters per 100 posts contact us and say, 'This part of the story isn't true.'" Not that it will make McGibney modify the post. That's because, he explains, "It's not up to us to decide who's lying."

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