I would like to create an app that you sign up for and allows you to send messages to a group that you create or subscribe to or/and send the message to people that are logged into the app within a certain proximity. You can also see how many people are in your certain proximity radius via map view. You can also comment on the messages that you receive.
Very simple app. I would like to limit the characters as well as be able to lock accounts and scan posts for inappropriate content.