Facebook was a very big mission; it really knocked it out of the universe. It's pretty hard to focus on a small idea after that. You really have to be working on something that you believe will be of similar impact.

For most people, their wealth accrues slowly, and at any given point they say, 'Okay, I should kick up my standard of living because now I've earned slightly more wealth.' I went from the dorm room to having a billion dollars.

I used to be really anxious about money. I got that from my parents. I still am, but for entirely different reasons.

It was a precondition to leaving Facebook that I wasn't going to start something that was just about chasing money.

It's a noisy environment we all live in, whether it's traffic or the workplace, so it's very difficult to think about your life in general. A lot of people are afraid to do that. They like to hide behind their work and not face up to a big problem in their life.

Before the arrival of my first son, I gave up on the moribund business of magazine publishing, where I had long dreamed of a career, and went to work in advertising. That I could be paid great money to write was incredibly hard to believe.

Business coaching and the personal development and self-help industry is considered to be one of the booming industries today.

My initial career, really, as a baby, was as a singer.