Homophily

Homophily (i.e., `love of the same`) is the tendency of individuals to associate and bond with similar others. The presence of homophily has been discovered in a vast array of network studies. More than 100 studies that have observed homophily in some form or another and they establish that similarity breeds connection. These include age, gender..
Found on http://en.wikipedia.org/wiki/Homophily
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