This study was performed to identify the relationship between the SNS addiction tendency, selfassertiveness and interpersonal problems in college students. The subjects consisted of 198 students in Korea. The data were collected using a self-report questionnaire from September 10 to 12, 2013. The data were analyzed by frequency, t-test, ANOVA, and Pearson's correlation using SPSS for Windows version 22. The SNS addiction tendency was significantly negatively correlated with self-assertiveness(r=-.148, p<.05) and significantly positively correlated with interpersonal problems (r=.434, p<.001). Self-assertiveness was significantly negatively correlated with interpersonal problems (r=-.459, p<.001). The higher the SNS addiction tendency, the lower the self-assertiveness and the higher the interpersonal problems. The lower the self-assertiveness, the higher the interpersonal problems. Therefore, to decrease the SNS addiction tendency, increase the self-assertiveness and decrease the interpersonal problems, it is necessary to develop and test program.