Airbnb co-founder Joe Gebbia announced his decision to step down as CEO, but he will remain on the board. Gebbia has been with the company since its founding in 2007. He is the first of three founders to decide to stop participating in the company's operations. "The main reason ... is that Airbnb is the only company I've ever helped create, and my brain is bursting with new ideas I want to bring to the world," he said in a letter to employees.