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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.

If you have a native monetization system where the atomic unit of content is the ad unit, that scales down all the way to a small screen experience. That's why Twitter is performing so well on mobile.

When we think about the characteristics of Twitter that make it unique, it is all of public, real-time, conversational, and distributed. We are the only platform that is all of those at scale.

Twitter was a mere prototype in 2006; now, many of us have become adept at saying all we have to say in 140 characters.

Twitter is one of those dangerous toys that if it gets in the hands of the wrong person you'll have the mind of a 12-year-old masquerading as an adult.

I think that content posted to Twitter is distributed to more platforms, services, sites, online and offline than any other services out there. Would love to see if someone can prove to me otherwise.

There are risks in the sheer brevity of Twitter, and it's actually quite an elegant art reducing what you have to say to 140 characters, and it's something that I quite enjoy attempting to do.

Twitter was like a poem. It was rich, real and spontaneous. It really fit my style. In a year and a half, I tweeted 60,000 tweets, over 100,000 words. I spent a minimum eight hours a day on it, sometimes 24 hours.

When people come to Twitter and they want to express something in the world, the technology fades away. It's them writing a simple message and them knowing that people are going to see it.