Every doctor has to deal with unhappy patients from time to time. The proliferation of social media websites such as Facebook, Yelp and Twitter, as well as doctor-specific rating sites like Healthgrades.com, Vitals.com and RateMDs.com have allowed unhappy patients the means to seriously damage your on-line reputation, regardless of the quality of services you provide or the merits of the complaint, and can have a devastating effect on your ability to grow your practice.