The JamPad served two primary purposes: a place for Travis Kalanick to crash, and a place for Travis Kalanick and his techie friends to riff on ideas. “Jamming,” in Kalanick parlance, was like playing in a jazz quartet or a psychedelic rock band. Kalanick’s enthusiasm and support for risk-takers bred around him a small following of devoted friends. It all started, he would say, with a jam sesh.