Not only can you not plan the impact you're going to have, you often won't recognize it when you're having it.

Successful businesses measure and count things. I think that's a safe assumption on top of which we can drop the following hypothesis: unsuccessful business either measure nothing, the wrong things, too many things, or finally, they measure the right things but they don't communicate the measurements efficiently.

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.

There is no script. Live your life. Soak it all in.

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.

The way you build trust with your people is by being forthright and clear with them from day one. You may think people are fooled when you tell them what they want to hear. They are not fooled.