From a quick glance (sorry, I don't register for facebook apps) it seems to me you just need people using it in the same location. The most sensible marketing

From a quick glance (sorry, I don't register for facebook apps) it seems to me you just need people using it in the same location. The most sensible marketing idea to me is using it in your town. Get your friends to test it out, make plans on it, demo it anywhere you can. Find all the local people/groups in your area (meetup.com, facebook groups, craigslist, online dating sites, whatever else comes to mind?) You need a critical mass in a given location for it to work (I hope you live somewhere crowded... not on a rural farm!). I say pick your own city because you may have an easier time connecting with people locally rather than cold emails/calls. Now is that time to spend any and all goodwill getting people to try it out.