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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.

MySpace is like a bar, Facebook is like the BBQ you have in your back yard with friends and family, play games, share pictures. Facebook is much better for sharing than MySpace. LinkedIn is the office, how you stay up to date, solve professional problems.

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.

Social media is just a platform. Twitter is a very simple and immediate broadcast platform. Facebook is a very personal, when it comes to friends and when it comes to fan pages, a little bit less but still somewhat personal way to communicate.

Social media has shaken up the world of sales, with Facebook, LinkedIn and Twitter offering new ways to hound leads and unprecedented insights into clients.

Social networking websites like Facebook, Twitter, and Tumblr provide an unparalleled ability for people to stay connected in new and unique ways.

The way the Facebook network is set up, it's not as suitable for content discovery. Twitter is better, but there are too many over-sharers. Also, on Twitter and Facebook, everything comes from people you know. On StumbleUpon, it comes from people that you don't necessarily know but share your interests.

Twitter isn't a social network, it's an information network.

Twitter and Facebook are such amazing networks for me to introduce myself to the world and for fans around the world to introduce themselves to me.