Some good news.
"These gag clauses are now banned under the new law, as is a restaurant or other business’s ability to impose penalties of any kind on customers who do post bad reviews. The insanest of these was probably the Union Street Guest House’s in upstate New York; it threatened to make a wedding party pay a $500 fine for every bad review guests left on Yelp. Now that Obama’s signed the act into law, though, the feds have power to go after companies that try to intimidate customers into shutting up."
read more: Obama Protects Yelpers’ Right To Leave Terrible Reviews