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 Yahoo Sales Decline As Advertisers Shift to Mobile, Programmatic Buying More Ads Bought Through Ad Exchanges Means Less Revenue For Yahoo By Tim Peterson, Published on July 16, 2013 2 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. Register Now Already a member? Log in.