It's never a metric, it's where the person is going or not. Metrics are used to make things work better, but don't necessarily make a business better.

There are three things you need to do as a CEO-founder. Think strategically, drive design, and drive technology. Some people who are really good at one can build a pretty foundational company. Most people who are very successful are good at two. But Jack is the only person in the Valley I've met who's all three. He's a first-rate strategist, a first-rate designer, and a first-rate technologist.

It's easy to shortcut when you get busy explaining the why's of the world, but it's very important to try.

Ultimately, I don't believe that you can build a company without a lot of effort, and that you need to lead by example.

Most people would agree that the details matter when it faces the user. But where the real debate is on things that don't face the user.

Most people will solve the problems they know how to solve. Roughly speaking they will solve B+ problems instead of A+ problems. A+ problems are high impact problems for your company but they're difficult problems.

Don't accept the excuse of complexity. A lot of people will tell you, this is too challenging, this is too complicated, yeah well I know other people simplify but that's not for me, this is a complicated business. They're wrong. You can change the world in 140 characters.