other demographic characteristics (Jackson, 2010). We present novel evidence on an understudied source of homophily … than 2,500 French high-school students, we find high levels of homophily across all ten behavioral traits that we study …. Notably, the extent of homophily depends on similarities in demographic characteristics, in particular with respect to gender …

, connections increase over time, but homophily on gender and ethnicity is relatively constant across time, university residences … layers. Furthermore, we see assortativity in homophilous tendencies. There is weaker, albeit significant, homophily over …