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 Who Dominated the Social Conversation About SXSW? Well, Mashable Blog Dominates Social-Media Mentions of SXSW, as Google, GroupMe, Foursquare, Twitter and Facebook Follow By Andrew Hampp, Published on March 16, 2011 2 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.