You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Who Are Your Facebook Fans? Your Best Customers. New Study of Four Brands Shows That 'Fans' Have Value, If You Earn Them By Josh Bernoff, Published on April 10, 2012 5 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.