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 Is a Yahoo-Owned Tumblr More Attractive to Brands? The $1.1 Billion Deal Gives Microblogging Platform Sales Cred, But a Bid to Ramp Up Ad Revenue Could Disrupt Product By Cotton Delo, Published on May 19, 2013 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.