Objective: The present study was to investigate the relationship between social network site use, upward so- cial comparison and depression in adolescents. Methods: Totally 603 adolescents were assed with Social Network Site In- tensity Scale, Iowa-Netherlands Comparison Orientation Measure for Chinese Adolescents and CES-D Self-Report Depres- sion Scale. Results: (1)Social Network Site Intensity was positively correlated with upward social comparison, and Upward social comparison was positively correlated with depression; (2)Social netw...