A war of words between Yelp and casino mogul Steve Wynn is getting ugly. In a post on Yelp's blog earlier this month, the online review site slammed Wynn for trying to "erode your free speech rights." The fight revolves around Wynn's support for SB 444, a controversial Nevada law that would make it easier for businesses to sue people for "defamatory" activities like posting negative Yelp reviews.