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Social network sites (SNSs) allow young people to experiment with and present different aspects of themselves during important periods of self-concept development. Interestingly, whether SNSs have negative or positive effects on self-concept clarity (SCC) is inconclusive. We propose that SNS use may simultaneously produce negative and positive effects on SCC, depending on how people use it and the social connection quality created on-line. Specifically, the suppressing mediation model reveals that the direct effect of SNS use intensity on SCC is negative, whereas the indirect effects via perceived social support and self-esteem are positive, suggesting these variables may suppress the negative effect of SNS use on SCC. Our framework helps to explain how SNS contexts influence identity development in young people. [ABSTRACT FROM AUTHOR]