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.

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.

You are not going to do most of the work. You shouldn't be doing most of the work... and the way you get out of doing most of the work, is you delegate.

The real thing you do is you ask a lot of questions.

Force yourself to simplify every initiative, every product, every marketing, everything you do.

Barrels are very difficult to find. But when you have them, give them lots of equity. Promote them, take them to dinner every week, because they are virtually irreplaceable because they are also very culturally specific. So a barrel at one company may not be a barrel at another company. One of the ways, the definition of a barrel is, they can take an idea from conception and take it all the way to shipping and bring people with them.

Building a company is basically taking all the irrational people you know... Putting them in one building and then living with them 12 hrs a day at least.