Twitter is the ultimate service for the mobile age. Its simplification and constraint of the publishing medium to 140 characters is perfectly complementary to a mobile experience. People still need longer stuff, but they see the headline on Twitter or Facebook.

One of the things I've been working on for the past few months is a radical simplification of the interface.

I don't care how someone lives or how good their spoken English is. I do all of my interviews on Skype text chat - all that matters is their work.

Twitter is the ultimate service for the mobile age. Its simplification and constraint of the publishing medium to 140 characters is perfectly complementary to a mobile experience. People still need longer stuff, but they see the headline on Twitter or Facebook.

I don't have big ideas. I sometimes have small ideas, which seem to work out.

Usage is like oxygen for ideas. You can never fully anticipate how an audience is going to react to something you've created until it's out there.

I do my best stuff midmorning and superlate at night, from 1 to 5 in the morning. Some people don't need sleep. I actually do need sleep. I just sleep all the time. I'll catch naps in the afternoon, or I'll take a 20-minute snooze in the office - just all the time. Our business is 24 hours. Our guys in Europe come online at midnight.