Human Nature 24 (3):336-347 (2013)

Abstract
Cooperation requires that individuals are able to identify, and preferentially associate with, others who have compatible preferences and the shared background knowledge needed to solve interpersonal coordination problems. The present study investigates the nature of such similarity within social networks, asking: What do friends have in common? And what is the relationship between similarity and altruism? The results show that similarity declines with frequency of contact; similarity in general is a significant predictor of altruism and emotional closeness; and, specifically, sharing a sense of humor, hobbies and interests, moral beliefs, and being from the same area are the best predictors. These results shed light on the structure of relationships within networks and provide a possible checklist for predicting attitudes toward strangers, and in-group identification
Keywords Cooperation  Altruism  Emotional closeness  Similarity  Homophily  Social networks
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DOI 10.1007/s12110-013-9174-z
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References found in this work BETA

The Evolution of Reciprocal Altruism.Robert L. Trivers - 1971 - Quarterly Review of Biology 46 (1):35-57.
Social Network Size in Humans.R. A. Hill & R. I. M. Dunbar - 2003 - Human Nature 14 (1):53-72.

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Citations of this work BETA

The Anatomy of Friendship.R. I. M. Dunbar - 2018 - Trends in Cognitive Sciences 22 (1):32-51.

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