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Twitter can be great and very bad.

Twitter has restored my faith in humanity. I thought I'd hate it, but while there are lots of knobheads, there are even more lovely people. It delights me how witty and friendly most people are.

On the one hand Twitter gives you the opportunity to engage with people, which is great, but on the other there are people who feel they can say whatever they want, put poison out there, really, without fear of any repercussions.

Twitter is the Devil's playground.

I love Twitter.

Tweeting is really only good for one thing - it's just good for tweeting... It is rewarding, because it's just its own reward. It's sort of like heaven.

I think Twitter is great.

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.

Twitter does have an effect on everything - things you put out there, they are out there for good.

I love Twitter! At first I made fun of it, because it is very narcissistic, and there's already so much narcissism flowing in this industry, I was like, 'Really, one more?' So I was against it at first. But I really love the idea of the direct connection - there's no middle man muddling it up.