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's Plan to Amp Up Ad Revenue Until Now the Social Network Has Focused on Growth, Luring 222 Million Unique Visitors a Month By Michael Learmonth, Published on February 02, 2009 10 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.