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

There's no such thing as a superhero, but together we can world in a new direction.

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?"

Doing startups is all about making mistakes.

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

Positive culture comes from being mindful, and respecting your coworkers, and being empathetic.

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.