When researching consumer behavior, we have been using the concept of communication circles for about 10 years. The main change from then to now is that people today have a completely new tool to reach out and stay in touch: Facebook.
The concept of communication circles is very simple. In the middle you have yourself. Then you categorize the people you are in frequent contact with in circles around you. Throughout the years the circles have been relatively constant. Until Facebook.
Read this post at: http://www.ericsson.com/thinkingahead/the-networked-society-blog/2011/10/21/facebook-and-the-new-communication-circles/
Mikael Eriksson Björling 
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