It is sort of mind boggling that revs are so low with 150 employees, and having been around as long as they have. They should definitely be able to make sizable coin through partnerships with retailers offering deals or discounts when their customers announce their presence in a retail location via a check-in. This seems like a lay-up for both four square and retailers. Why are they not doing more biz in this arena? Retailers pay to track customers in the on-line world, why can't foursquare grab money for tracking them in the offline world? Are their structural impediments?