What Foursquare and GoWalla are missing is the payment portion of things. It's a lot more interesting knowing when you've bought something repeatedly relative t

What Foursquare and GoWalla are missing is the payment portion of things. It's a lot more interesting knowing when you've bought something repeatedly relative to merely knowing that you were kind of nearby. (Hint: anyone from Foursquare or GoWalla, we're happy to talk!)