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 RebelMouse Hires WPP Exec David Spitz As President and COO Hire Comes One Year After HuffPo CTO Paul Berry Launched the Social Publishing Tool By Alexandra Bruell, Published on September 10, 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.