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 Brands Battle Facebook's Spam Problem One Cost of Doing Business on the Social Network Is Discerning a Real Fan (or Foe) From a Canned Ham By Irina Slutsky, Published on April 21, 2011 8 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.