Here is a 1-paragraph summary of the text: Chad Smith and Mark Brenneman have won the Startup Bus/SXSW contest with their app "Textmob", which combines Twilio and 2D barcodes to make it easy for businesses to organize and participate in conference calls. The app was initially created as a simple RSVP webpage, but after its success, Chad decided to build a scalable version that could be used for various events and even integrated into an event planning system. He found the experience of integrating Twilio with his chosen tools and technologies to be easy, and he has also worked on other projects such as an SMS buzzer system and a smart voicemail system.