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 Stat of the Day: Americans Spent 53 Billion Minutes on Facebook in March Average User Spent 5.8 Hours on Site in Month, Adding up to Cumulative 100,000 Years By Matt Carmichael, Published on May 12, 2011 4 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.