Update: Just looked 'em up. They're trying to go from "fun" to "useful" by hooking up with Groupon, I guess that would make them the social Google Maps for Groupon. IMO that's using peer influence (teens) for group purchases (teens don't have CCs usually). Unless, unless they use social influence to bring new coupon purchasers for groupon (affiliate sales or reseller?) or are able to tip groupons that have been historically harder to tip by getting friends to get involved in activities together.