One thing worth noting: Doctors aren't able to respond to reviews at all. If a patient posts a completely baseless, factually untrue review of a doctor, the doctor cannot say anything due to privacy laws regarding the patient. This is in comparison to local businesses on a site like Yelp, where a business is allowed to talk about a customer's situation if the customer posts something defamatory. The doctor's only recourse in such situations is to sue the patient, something which is a) expensive b) time consuming and b) generates bad publicity. Not saying that patients should be forced to sign such agreements, but it's worth noting that the playing field is not level.