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 Will Find Its Next Billion Users With U.S. Saturated, Social Site Turns to Advertising In Select Countries To Find Friends By Cotton Delo, Published on October 08, 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. Become a Member Already a member? Log in.