Social network

A social network is a group of people, not larger than about 150 people, who help each other without making it conditional on the exact situation. This is not like a contact network, creative network or power network, which put very specific conditions on help.

The Simple English article on 'social network' has more detail.

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Social network analysis

social network analysis may play a formal role in determining what information affects the Consumerium buying signal and may also impact the way some aspects of power structure are interpreted. Some references:

http://www.netform.com/html/information.html

See also the various social network services.