Around the world, Walmart associates feel more comfortable taking risk. They're launching minimum viable products to test and learn from. These have enough function to satisfy early adopters, whose feedback informs future design.

Ask for feedback from people with diverse backgrounds. Each one will tell you one useful thing. If you're at the top of the chain, sometimes people won't give you honest feedback because they're afraid. In this case, disguise yourself, or get feedback from other sources.

We all need people who will give us feedback. That's how we improve.

Look at the way celebrities and politicians are using Facebook already. When Ashton Kutcher posts a video, he gets hundreds of pieces of feedback. Maybe he doesn't have time to read them all or respond to them all, but he's getting good feedback and getting a good sense of how people are thinking about that and maybe can respond to some of it.

Understanding who you serve is always a very important problem, and it only gets harder the more people that you serve. We try to pay a lot of attention to this by a combination of very rigorous quantitative and qualitative feedback. But if you're serving 1.2 billion people, it's very hard.

We're going to build a better product than everyone else because we're going to get it out first or early. We're going to have a good feedback loop. We're going to get a bunch of feedback.