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 How Facebook Reaches $20 Billion in Revenue A Payments System and Social Ad Network Will Take It to a $100 Billion Valuation By David Pakman, Published on December 16, 2010 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. Become a Member Already a member? Log in.