People don't just stop playing Facebook games. They divorce them.

Why is it that big companies fail when the technology changes? It happens in every industry, so what's the pattern? What are they all doing wrong?

You don't want the office to be a completely relaxing place. You want it to be a vibrant place.

LinkedIn's got a little progress bar. It wants you to do things like sign up 10 of your friends. It does that near the end. At the beginning it's like, 'You put in your name. 20 percent progress! How about some other information?' People want to fill in that progress bar. They like to complete a task. They like to check a box.

One of the main things that's appealing about games is that you know a game can be won. It's an unusual game that's impossible to win.

We are shifting into an enjoyment-based economy. And who knows more about making enjoyment than game developers?

Facebook is terrifying to the traditional games biz.