中文摘要：

为探讨社交网站（QQ空间）使用对青少年抑郁的影响及其作用机制,在社会比较和抑郁易感性模型的视角下,采用社交网站使用强度问卷、上行社会比较问卷、自尊量表和抑郁量表,对964名中学生进行调查。结果表明：（1）在控制了性别、年龄以及社交网站使用年限后,社交网站使用对抑郁和社交网站中的上行社会比较都有显著的正向预测作用;（2）社交网站使用能通过社交网站中的上行社会比较和自尊的中介作用对抑郁产生影响,且该中介作用包含了两条路径——上行社会比较的单独中介作用以及上行社会比较-自尊的链式中介作用。本研究揭示了社交网站使用与抑郁的关系及其作用机制,深化了社交网站使用对个体影响的研究。

英文摘要：

With the rapid rise and increasing popularity all over the world, social network site（SNS） has become an important platform for interpersonal interaction, especially among adolescents. The impact of SNS use has become the focus of relevant studies. Empirical evidence has suggested a complex mechanism in the relationship between SNS use and psychological adaptions. In particular, SNS offers abundant opportunities for social comparison with detailed information about others. Besides, users tend to present an idealized version of the self on SNS. Therefore, the majority of the social comparative information that individuals receive on SNS may lean in upward comparison, which may cause people to feel inadequate, and have poorer self-evaluations and low self-esteem. The social rank theory of depression claimed that the feeling of subordination was the mechanism that can trigger depression. The vulnerability model of depression also stated that low self-esteem might cause the onset and maintenance of depression. Since depression is a common psychological problem for adolescents, this study aimed to investigate the effect of SNS（Qzone, which is the most popular SNS among Chinese adolescents） use on depression as well as its mechanism. We hypothesized that upward social comparison on SNS and self-esteem may mediate the relationship between SNS use and depression. A sample of 964 adolescents（mean age = 14.23 years, SD = 1.27） were recruited for the study. They were required to complete a battery of questionnaires, including Intensity of SNS use Scale, Upward Social Comparison Measure on SNS, Rosenberg Self-esteem scale and Center for Epidemiologic Studies Depression Scale（CES-D）. Based on the social comparison theory and the vulnerability model of depression, a multiple mediation model was constructed to analyze the mediating effects of upward social comparison on SNS and self-esteem in the association between SNS use and depression. The data were analyzed by the Mplus 7.0. Results indicated that：（1）