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Interesting, but IMO assuming that people made a concerted effort to send
Christmas cards to their full network of contacts would not be a strong
assumption to make for most Americans. I would imagine that an estimate
based on holiday cards would be only a fraction of the "full network". But
perhaps Christmas cards are a much stronger cultural practice among the


Valdis wrote:
Here is the on-line PDF... 

On Jan 2, 2006, at 10:37 AM, Lynn Smith-Lovin wrote:

> Hill, R.A. and R.I.M. Dunbar. 2003. "Social network size in  
> humans." Human Nature 14:53-72.

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