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

Success isn´t guaranteed, but failure is certain if you aren´t truly emotionally invested in your work.

If people are passionate about your product, whether it's because they're hating or loving it, those are both good scenarios.

Investors are employees you can never hire. We made sure to pick investors that thought like us.

I think before Twitter people didn't think that way, not in any sort of meaningful or specific way, so what I'm trying to say, if we're trying a bunch of stuff, a lot of cool and great social stuff, a lot of platform stuff, then some of it will stick, and some of it will be junked over. Some of it will be just like the cell phone, you can't imagine not having it.

Even though running is physically straining, it's mentally refreshing. Especially when you feel like you've accomplished something.

Lesson number one: opportunity can be manufactured. Yes, you can wait around for the right set of circumstances to fall into place and then leap into action but you can also create those set of circumstances on your own. In so doing, you manufacture your own opportunities. This has helped me immeasurably.