A questionnaire survey was conducted among 2 056 adolescents. The results find that:There was a significant positive relationship between extroversion,neuroticism and the use of the mobile social network,and openness,agreeableness,consciousness have significant negative correlation with mobile social networks; Extroversion and neuroticism has significant positive prediction for the use of mobile social network; Gender plays a moderating role between neuroticism and the use of mobile social networks. Therefo...