You can get more details from his interview at last year's startup conference.
The video is on youtube (watch at 1.25X speed if you are like me)https://www.youtube.com/watch?v=8FiXQ0htcvE
The video is on youtube (watch at 1.25X speed if you are like me)https://www.youtube.com/watch?v=8FiXQ0htcvE