Groupon Boston, Foursquare and Living Social have a new social coupon competitor in town It's called FlutterBuck. <br /><br />FlutterBuck, as opposed to Groupon, Foursquareand Living Social, give cash rewards for referring others to group buys and daily deals. <br /><br />Groupon Boston, Groupon Mass, Living Social Boston, <br />deal a day Boston, local deals Boston, daily groupon Boston, <br />Groupon Harvard,