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.

In order to succeed spectacularly you have to be willing to fail spectacularly.

The most rewarding thing for me has been this affirmation for me that people are basically good and smart, and if you give them a simple tool that allows them to exhibit that behavior, they'll prove it to you every single day.

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.

I knew Mac pretty well. I'd used them when I was younger.

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

Twitter provides a great amount of timely information, but we still need those people to fill out the rest of the story and the context.