Geo-social is the latest hit in digital marketing.  After years of corporations leaving the “fad” of social media work to interns, corporations now embrace new mobile technologies to create loyal customers.

Corporate America sees Loopt, a foursquare competitor, as an avenue for growth with 3 million registered users.  Loopt Star, an iPhone only app, has partnered with Gap to give a 25% discount to users that check in twice at a local store.  Universal Music Group is offering a deal for having several people check in to receive 5 free MP3s.  But do people even respond to this?

Pepsi is trying the free music rewards too, with their own exclusively branded app — even though they are partnered with foursquare.  Many