Geo-Based Social Network, Whrrl, wooed techhies at Austin’s South by Southwest with the promise of a pair of Audis. To participate, consumers had to download the app using snap tags, designated for their mobile device. Then once the app was loaded and a user account was created, the attendant gave the consumer a code on a keychain to check in on Whirrl. Throughout the 5-day interactive portion of SXSW, consumers can check in at multiple locations for more chances to win. Postcards at the booth directed consumers to those locations around the festival.