You made a factual claim with out any supporting facts. I pointed out that your claim was not established fact. I am aware that "I'm only asking questions" can be used to cast unwarranted doubts, but in this case the accusers are reputable and numerous enough that I think we should not pretend they don't exist. For example:

http://www.eastbayexpress.com/oakland/yelp-and-the-business-...

http://www.forbes.com/sites/jimhandy/2012/08/16/think-yelp-i...