TV and the press have always functioned according to the same sets of rules and technical standards. But the Internet is based on software. And anybody can write a new piece of software on the Internet that years later a billion people are using.

You only ever experience two emotions: euphoria and terror. And I find that lack of sleep enhances them both.

If you think you can execute a previously failed idea, you just have to be able to show that now is the time.

I've been an entrepreneur three times. I started three companies.

I don't waste time being depressed.

In a startup, absolutely nothing happens unless you make it happen.

There's a new generation of entrepreneurs in the Valley who have arrived since 2000, after the dotcom bust. They're completely fearless.