I don't think of Twitter as a social network. I think of it as a messaging system that has a lot of social components to it.

I started as an artist and I had a side job moving some heavy boxes for a publishing company. They had just gotten a Mac for their art department, the department that creates the book covers. I was kind of showing the art director a thing or two about how to use a Mac. And one day everyone went out to lunch and I jumped on the computer and designed a book jacket and slipped it in the pile to go to the review board in New York. They picked my jacket and when the art director got back to Boston, he wanted to know who designed it and I said, "Me." He was like, "The box guy?"

A personal belief is that if you're not personally invested in what you're working on, you'll fail.

I realized ceativity is a renewable resource. You never run out of good ideas

When a plane lands in the Hudson and there's a Twitter user on the ferry taking a picture of it, Boom. That's it. The water is still splashing. Here's the photo of the thing.

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

You can shut down a service, and yet people will find ways to communicate.