I created app for instant meeting. It uses the map to help you to find people in your own city with similar interests who are willing to meet in the moment. So you choose what you want to do, you publish a pin on the map with tags saying "Meet a girl" and "Get coffee" and girls can send you hangout request. Or you can look for other people on the map. So you know their approximate location, you know they are online willing to meet, you know their interests, nobody can spam you and you get what you want quickly. Since my app is trying to do similar thing like MeetUp with some significant changes and improvements, I would like ask for your help on how to do piggybacking on MeetUp. Like AirBnb did with Craigslist and PayPal with eBay.