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Twitter has been my life's work in many senses. It started with a fascination with cities and how they work, and what's going on in them right now.

I've come to really like Twitter. You really do get to see what I'm about, and I like sharing with my fans.

Twitter makes me feel like I have friends all over.

Twitter is essential to me because I wake up and check it religiously. It's a way I communicate with my fan base.

I don't want to be one of those people that's constantly promoting myself on Twitter. I think the fun thing about Twitter is being able to share all the little random things that happen in my life.

Twitter is the limit of me putting myself out there.

Twitter's a great way to tell people across the world what I care about and, hopefully, motivate them to join me in furthering my causes.

I don't do Twitter because I don't want to talk about myself more than I already have to.

Some people really like to get into Twitter, but it's not my thing.