I'm a big believer in online communities and in user-generated content.

Twenty years and $40 billion. They seem like good round numbers.

It's exciting to see how fast your kids learn and grow. I'm not too worried about them, particularly the ones who like to break rules and don't follow instructions; those are the ones that will do just fine because they know what's important to them.

I'm pretty active anyway, but I'm also competitive.I used my Fitbit as an example of the innate power of data to turn information into insights and actions.

Anything that can be measured can be improved

I had to give it a full go and see what happened.

If you want to sustain excellence over a long time, you'd better come up with a system that works well. Anyone can sprint for a little while, but you can't sprint for forty years.