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

I was in Shanghai recently, where Twitter is blocked, and yet there were ads and billboards across town with hashtags on them.

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

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

The key is to just get on the bike, and the key to getting on the bike… is to stop thinking about ‘there are a bunch of reasons I might fall off’ and just hop on and peddle the damned thing. You can pick up a map, a tire pump, and better footwear along the way.

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.

Twitter is a global town square.