You can look at the evolution of search as a play in three acts. The first is the 'public' Web, where if different people type the same query they'll all get the same results.

He is a great athlete and it shows in his play. We have a lot of confidence in him and his ability to lead our team.

This sort of information gathering is precisely what we call play. And the important function of play is thus revealed: it permits us to gain, without any particular future application in mind, a holistic understanding of the world, which is both a complement of and a preparation for later analytical activities.

Managers will tell people what to do, whereas leaders will inspire them to do it, and there are a few things that go into the ability to inspire.

Facebook is massive in scale and scope. Twitter is a public communication forum, but if I'm following you, you're not necessarily following me. LinkedIn is, simply, a professional network.

LinkedIn is increasingly becoming a very strong place for companies to develop their talent plans, their recruitment plans, and so there are ways in which we can track some of the momentum there.