When I was your age, we didn't have the Internet in our pants. We didn't even have the Internet not in our pants. That's how bad it was.

Don't always worry what your next line is going to be.

Believe that if you make courageous choices, and bet on yourself, then you will have an impact.

Believe that if you make courageous choices and bet on yourself and put yourself out there, that you will have an impact, as a result of what you do. And you don't need to know now what that would be or how will it happen because no one ever does.

When I was your age, we didn't have the Internet in our pants. We didn't even have the Internet not in our pants. That's how bad it was. I know I sound like my grandfather right now. We didn't have teeth! There were no questions marks, we just had words! What was I talking about? The Internet...Not only can you not plan the impact you're going to have, you often won't recognize it when you're having it.

If there's ever an example of the importance of making bold bets and focusing on what you love, it's Twitter.

People have Plato's form in their mind of what a leader is, or what a C.E.O. is, and it is a bunch of elements that I really don't conform to at all. I've given this a lot of thought, and I came to the conclusion that I don't care.