Among the location-based social networking startups that are making waves right now, I've always believed that Foursquare has the biggest potential to make it big, if it is not that big right now. Foursquare has every good things going for them - increasing usage, new mobile features here and there, and of course prospective buyers including Yahoo. In fact, Yahoo may seem to be the most serious among  the Internet players who wants to snag the hot social mobile platform.