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 Google Claims More than Half of Mobile Ad Pie, but Facebook's Slice is Growing EMarketer: 15.8% of Mobile Ad Spend Will Go to Facebook This Year By Cotton Delo, Published on August 28, 2013 0 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.