When I studied graphic design, I learned a valuable lesson: There's no perfect answer to the puzzle, and creativity is a renewable resource.

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.

We didn't have anything before Twitter that allowed a group of people roaming around a city to communicate instantly, in real time, and in a coordinated way, in a group.

The future of marketing is philanthropy.

I started designing book jackets, which was great because I was good at it. And then from there I decided to become a freelance graphic designer and I needed to expand beyond book jackets, so I taught myself web design, and then in 1999 some friends of mine decided to start a company called Xanga.com, which was a very early kind of social network slash blogging community.

You have to think for an email. What's the subject? What's it about? It takes two seconds to think about that. So you have to think, Is this a work thing or a social thing? Which? Then you get into a situation that you don't want to be in, because then people are thinking about it too much.

If you make the opportunity. you'll be the first in the position to take advantage of it.