Lots of good advice from others here. The point is reiterated that you need users to be useful--but that's not exactly the case. What you need is data, more spe

Lots of good advice from others here. The point is reiterated that you need users to be useful--but that's not exactly the case. What you need is data, more specifically information on someone nearby your User who wants to meet up. So searching your local existing user-base for nearby other users is the easiest way, and if you limit yourself to that, the only way. But since you really just need other people's information, you can just steal that information. Monitor places like meetup.com, public tweets, public facebook posts, craigslist, etc. Direct your Users to the results. Possibly solicit other people on behalf of the User. (There are a lot of "Anyone at Hotel X want to grab a coffee?" posts at conventions, for instance, often with hashtags you can set followup monitors on.) Sign up with the top competitor and route some queries through their network. > During our last startup, we sacrificed all the time we had with friends, family, and ignored our relationships for the most part. So you're not doing this any more, right? Good. Especially for your case, you should constantly be thinking about how you meet other people and how you signal your desire to meet other people, strangers or not, and work on figuring out how to assimilate the data and the action into your app.