To explore the relationship between self-disclosure on social networking site (SNS) , and loneliness, the mediating role of perceived positive feedback and the moderating effect of self-esteem on the mediating process, questionnaires of self-disclosure on SNS, perceived positive feedback, self-esteem and loneliness were completed a- mong 1588 middle school students from 8 schools in Wuhan aged from 11 to 19. The results indicated that: (1) self-disclosure on SNS negatively predicted adolescents' loneliness (2) perceived positive feedbac...