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 The Verdict for Brands in PeopleBrowsr vs. Twitter A Warning For Analytics Startups Attempting to Build Businesses on Twitter By David Berkowitz, Published on November 30, 2012 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. Become a Member Already a member? Log in.