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

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

I haven't been paying attention to politics long enough to have really smart opinions.

With Twitter, it's as easy to unfollow as it is to follow.

When you think of a social network, you have these two-way interactions: "Are you my friend? Yes? No? Yes?" Like LinkedIn, it's business oriented, but it's all about establishing connections. You connect to me through my other connections, and that sort of thing, and you sort of define who your friends are. Twitter doesn't have that.

I mean just look at haiku, the idea of it. We want to focus on that singularity, on that simplicity, but we still want to add features and add value, but we want to do it in a way that fits in with that mentality of simplicity. You have to spend a lot of time thinking about it.

Creativity is an infinitely renewable resource - you are not going to run out of it - so don't be afraid to use it.