Check out Social Passport (www.socialpassport.net) as it will be totally up your alley. For consumers it creates a QR code which stores all of your social networking information for instant scanning to Like, Tweet, or Checkin somewhere, and then also serves as a digital loyalty card and e-coupon. Merchants incentivize users to get their Social Passports scanned through discounts, contests, and giveaways, and in return send a customized message to a user's entire social network.