This represents the people you know and the ones they know, etc... There is a famous theory of the 6 degrees : You know all the people on earth through max 6 persons.
There is a bunch of websites out there that emphasize social networks and tend to put this human relationships into databases. Some are professionally oriented like http://www.linkedin.com , some are more personally oriented like http://www.friendster.com ,etc... Yahoo 360掳 (http://360.yahoo.com ) also is a kind of social network as you can invite your friends to your profile and share content with them.
What is Social Network?famous myspace
A social network is a social structure between actors, mostly individuals or organizations. It indicates the ways in which they are connected through various social familiarities ranging from casual acquaintance to close familial bonds. The term was first coined in 1954 by J. A. Barnes (in: Class and Committees in a Norwegian Island Parish, "Human Relations").
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