
SixDegrees.com was a social network service website that lasted from 1997 to 2001 and was based on the Web of Contacts model of social networking. It was named after the six degrees of separation concept and allowed users to list friends, family members and acquaintances both on the site and externally; external contacts were invited to join the s...
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http://en.wikipedia.org/wiki/SixDegrees.com

(from the article `Social NetworkingMaking Connections on the Web`) ...to draw Web surfers to its site. It based its social network on the existing connection between members of high-school and college graduating ...
Found on
http://www.britannica.com/eb/a-z/s/104
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