Don't let people who you may respect and who you believe know what they're talking about, don't let them tell you it can't be done because often they will tell you it can't be done, and it's just because they don't have the courage to try.

In 1991, I co-founded my first start-up, Ink Development, which made software for an early tablet computer.

We believe people are basically good. We believe everyone has something to contribute. We encourage you to treat others the way that you want to be treated.

In the same way that you're driven in your business to keep innovating - Facebook is a wonderful example of constant innovation - think about doing that in philanthropy.

I just kind of had this naive approach to - well, gee, you know, why not. I’ll just go ahead and do it.

I always kind of just went ahead and tried things.

I want people to be entrepreneurs, but I want them to do it for the right reasons, because they think they can change the world, because they think they have got something of value to give to the world. Not because they think they can make a lot of money.