  Using network analysis, psychologists have already found the nontrivial
correlation between personality and social network structure. Despite the large
amount of empirical studies, theoretical analysis and formal models behind such
relationship are still lacking. To bridge this gap, we propose a generative
model for friendship networks based on personality traits. To the best of our
knowledge, this is the first work to explicitly introduce the concept of
personality and friendship development into a social network model, with
supporting insights from social and personality psychology. We use the model to
investigate the effect of two personality traits, extraversion and
agreeableness, on network structure. Analytical and simulation results both
concur with recent empirical evidence that extraversion and agreeableness are
positively correlated with degree. Using this model, we show that the effect of
personality on friendship development can amount to the effect of personality
on friendship network structure.
