A new CFA report compares information about individual real estate agents provided by widely used online information sources – Zillow, Realtor.com, HomeLight, Yelp, Facebook, and the websites of the agents themselves.  The report concludes that Zillow agent profiles represent the most useful source of information.  Zillow profiles cover a large majority of active agents and include current listings, past sales and their price history, customer reviews, and other information for most of these agents.