A Facebook application administered
a personality questionnaire and objectively recorded properties of the participants’ (N = 5031;
65% female, mean age 33 years) social networks. As expected, Extraversion predicted Degree, whereas
Openness to Experience and, among men, Agreeableness predicted more cross-sex friendships. Also as
expected, Extraversion and, among men, Openness to Experience predicted lower Transitivity, but the
former association was rendered insignificant when Degree was controlled for.