Hi, I'm the author, happy to answer questions.
I think you should give more consideration to empty states, in particular for metro areas not SF (or where ever this currently has active usage) to encourage new users of your app to generate content. As it is now, I don't know what I should do or why I should do it.
A small side note: on app activation any sound playback is paused in iOS. This is a bit annoying and not expected behavior for this app.