Both my wife and I have a lot of compassion for animals in general.

The reason I really started running was for meditative purposes. I would pick some problem to have in my head while running.

In any leadership position, you're always going to be disappointing somebody.

Even the simplest tools can empower people to do great things.

At Twitter, mobile is in our DNA ... For us, it's all about mobile, and it always has been.

When you think about email or IMing, why aren't you writing back? I can see your avatar, I know you're online, why aren't you writing me back? But with Twitter, everybody sends their responses to Twitter, and Twitter then sends them out to everyone. So there's not this constant connection. You can be hyperconnected, then you can take a break for a couple days and it's fine.

The two things I use the most are the MacBook Air and my iPhone. Those are my two most-used gadgets that are dented, scratched and smashed.