I'd love to see a hyperlocal (bluetooth, maybe?), mesh network-based messaging app popularize. I uncertain if you'd be able to charge for it though, since users

I'd love to see a hyperlocal (bluetooth, maybe?), mesh network-based messaging app popularize. I uncertain if you'd be able to charge for it though, since users are often of the "open, free access for all" type. Marketing to a different demographic may help though. For the common high school student, something that allows messages to be sent without service or WIFI sounds valuable.