If there are no features and no GUI to explore without having contacts added, how are you going to introduce and retain new users? This idea appears similar to

If there are no features and no GUI to explore without having contacts added, how are you going to introduce and retain new users? This idea appears similar to something I have been working on. Does the service compile data and statistics for local events, activities, and locations? Perhaps new users could explore this aggregate data before adding contacts. The services you mention such as Twitter and Facebook both allow users to explore the application without adding contacts.