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 QR Codes: Game Changer or Passing Fad? How Quickly Has Your Agency Responded to This Tech? By Tom Martin, Published on March 17, 2011 57 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.