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 What's Making 'Friends' With a MySpace User Worth? Fox, Carat Study Tries to Quantify Return of Social-Network Marketing By Abbey Klaassen, Published on April 23, 2007 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.