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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.

LinkedIn is the Netscape of its era.

LinkedIn was an amazing deal for us to do because of their mission.

If you can get better at your job, you should be an active member of LinkedIn, because LinkedIn should be connecting you to the information, insights and people to be more effective.

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.

Building out a professional profile on LinkedIn certainly makes sense, and bolstering that CV with intelligent pieces of writing is also a great idea. But if you're going to take the time to create content, you should also take the time to create a home for that content that is yours and yours alone.

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.

LinkedIn and Flickr, among other sites, have already proven freemium can generate revenue in the social media context.

Facebook is the social graph with the organizing principle around your friends and your social life. LinkedIn is the professional graph, organized around you, your job, your industry, your title and your function. At Chegg, we are building a student graph centered around you, as a student.

The reason the social-networking phenomenon is something that I invested in early and massively - I led the Series A financing for Friendster; I founded a company called Socialnet in 1997; I founded LinkedIn; and I was part of the first round of financing in Facebook - it sounds trivial, but people matter.