Social graph?

degrees of separation?

Ten words.
Social Graph = Your relationships and the relationships of others within Social Networks.Two words.
Social Graph = Social Networks.

To see some good examples of social graphs in action, i suggest giving Touchgraph a visit. they offer a nice facebook and google social graphing service. sample attached is the Gooruze google social graph using the Touchgraph service.

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I'm going to cop out and refer you to a great explanation by Jeremiah Owyang:
www.web-strategist.com/blog/2007/11/10/what-is-social-graph-executives/

"The Social Graph is the representation of our relationships. In present day context, these graphs define our personal, family, or business communities on social networking websites"