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 to Bring More Ad Formats to Tumblr, Mayer Says Acquisition Will Also Allow Individual Tumblr Users to Host Ads By John McDermott, Published on May 20, 2013 1 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.