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 Report: Facebook and Google Sprint Ahead in U.S. Display Sales Two Upstarts Increasingly Leaving Yahoo, Microsoft and AOL in Their Rear-View Mirrors By Jason Del Rey, Published on February 22, 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.