This part Friday at our Social Currency CrunchUp I was joined on stage by Tristan Walker (director of business development at Foursquare), Kara Nortman (Senior Vice President of Publishing at CityGrid Media), and Shiva Rajaraman (a product manager at Twitter) to talk about check-ins, coupons, and commerce. You can watch the entire conversation in the video above, but I wanted to highlight a few key parts of it. Overall, an element that kept popping up during the talk was the idea that the check-in is just the first (or base) component of location. All parties seemed to be in agreement that the field was going to expand far beyond that. Obviously, Foursquare is one of the key players there (and popularized the term itself), but even Walker agrees that they are going to have go beyond this first phase. He notes that the key to Foursquare is to "socialize loyalty" no matter how that is done.