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.

The first thing that editor does is they take out a red pen, or nowadays you go online, and they start striking things. Basically eliminating things, the biggest task of an editor is to simplify, simplify, simplify and that usually means omitting things.

You really need to spend a lot of your time focussing people.

Treat customer support as a product.

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.

What you actually want to do with every single employee, every single day is expand the scope of their responsibilities until it breaks.

The key metric of whether you've succeeded is what fraction of your employees use that dashboard everyday.