You have the classic chicken-egg social networking problem. To get users, you need users. So how do you get users? Actually you don't need users to start, you

You have the classic chicken-egg social networking problem. To get users, you need users. So how do you get users? Actually you don't need users to start, you just need good source of events that users might be interested in. You can make the app more functional by including other sources, such as the Meetup API: http://www.meetup.com/meetup_api/ http://www.meetup.com/meetup_api/ Then, even if no one's posted through your app itself, they can find things to do.