Social network size in humans

@article{Hill2003SocialNS,
  title={Social network size in humans},
  author={Russell A. Hill and Robin I. M. Dunbar},
  journal={Human Nature},
  year={2003},
  volume={14},
  pages={53-72}
}
This paper examines social network size in contemporary Western society based on the exchange of Christmas cards. Maximum network size averaged 153.5 individuals, with a mean network size of 124.9 for those individuals explicitly contacted; these values are remarkably close to the group size of 150 predicted for humans on the basis of the size of their neocortex. Age, household type, and the relationship to the individual influence network structure, although the proportion of kin remained… 

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