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 Exodus? Facebook Trumps Top 20 Sites in Time Spent Length of User Experience Can Help Media Buyers Gauge Influence, and Soc-Net Is at the Top of the Pack By Abbey Klaassen, Published on September 07, 2009 6 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.