Yelp recently won a case against a dentist who tried who sued the site over a negative review, claiming defamation and "deceptive acts and practices" under New York state law. The defamation part was pretty much old hat. This is not the first time someone has tried to sue the owners of a site (or even Yelp specifically) because they didn't like a review. The second part was new to the story, though the court still moved to dismiss it.