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 How Facebook's Geo-Networking Plans Will Change Everything What a Check-in on Facebook Will Mean for Foursquare, Gowalla and Marketers By Ian Schafer, Published on May 10, 2010 15 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.