David Perry

The power of Facebook is not only in the vast size of the connected audience, but also in the quality of the social ties and interactions that occur within the network. The Facebook social graph fuels our mantra 'Try it for free', 'Share it if you like it', 'Buy it if you love it.'

I actually once sat at the back of a payroll class in America - just me and 40 women! And I'm sitting back there, learning payroll, because I want to understand it. So that when I talk to people about payroll I know what they're talking about. And I set up and managed and ran a full payroll system myself.

After decades spent in rewrite rooms surrounded by other shouting writers, I discovered that I work best alone. I like being in charge of my time, working out the problems according to my own rhythms and being able to nap. That's a big one, the napping on demand!

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.