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 Q&A Sites Struggle to Gain Traction as Viable Biz Models Though a Surprising Number of Users Have Bought Into Quora and Others, Advertisers Aren't Quite Convinced By Matthew Creamer, Published on February 27, 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.