TransitChatter was created to help riders stay informed, entertained, and make it easy to contribute to the common good. It is a mobile app for people that use the CTA in Chicago. It has many features which riders want; i.e. arrival/departure times, specials that are offered near the next stop, a way to share your experiences anonymously, get service alerts and more.
TransitChatter pitched their app at the BNC VC Group meeting on August 6, 2013. Here is their pitch.
Their website is: transitchatter.com
You can download the app at their website, on the Apple App Store and on the Google Play site.