I'm working on ConvoSpot (SnapChat for YikYak) iOS App. ConvoSpot creates small, temporary, geo-based chat rooms (convospots) so you can chat with people around you, and within a few hours, the messages vanish and are purged from our systems.

App Store: https://itunes.apple.com/us/app/convospot/id856444697

Site: http://www.convospot.com/

The project has been a lot of fun and I've learned a lot. We released version 2 a few weeks ago and have been getting positive feedback from a passionate, but small(and growing) user base.