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 General Motors Social Chief Christopher Barger Jumps to Porter Novelli Digital Shop Voce Q&A: On Social Media's Maturation, Overemphasis on Fan Counts and Chrysler's Instantly Infamous F-Bomb Tweet By Thomas Pardee, Published on March 24, 2011 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. Register Now Already a member? Log in.