there's no libel suit without libel. (i challenge you to show me the libel on chattel.me. maybe that's a bad incentive. nevertheless, what i've written holds true in spirit. 1. no one cares about this website and as a result, there's no libel on it; 2. seems that even the opportunity for anonymous speech doesn't generate the amount of vitriol one might expect (maybe there should be a "... yet" after that), perhaps redeeming this project and all of humankind with it.)
More accurately, it's going to set someone up to be hit in a libel suit. The site is no more liable that tumblr is when someone starts a libelous blog using their system.