The caliber of the partnerships that location-based startup Foursquare keeps landing continues to be impressive. A new tie-up with VH1 will see the cable network promoting Foursquare through the commercial below -- all Summer long. Foursquare has had commercials before -- like this Bravo one in February -- but this one should be the biggest draw for the masses yet. Foursquare has linked up with VH1 and Live Nation for an "unlock it to rock it" promotion. The commercial not only plays up the ability to win Foursquare badges, but also a contest that will have a winner getting access to a year's worth of concerts for free.