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 Facebook Admits Organic Reach Is Falling Short, Urges Marketers to Buy Ads Brands Urged to Think of Fan Acquisition As Way to Enhance Performance By Cotton Delo, Published on December 05, 2013 35 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.