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 Groupon CEO: We Placed Too Much Trust in Agency for Super Bowl Ads Andrew Mason Says Group-Buying Site 'Turned Off Part of Its Brain' When Working With CP&B in Aim to Be 'Edgy' By Rupal Parekh, Published on March 21, 2011 42 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.