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Social Networking Sites (SNS) Keywords: Implicit narcissism, Attachment instability, Social Networking Services (SNS) addiction, Attachment anxiety KEY POINTS What is known about this topic-In addition to the positive aspects, SNSs are also causing negative problems -Implicit narcissism is associated with Internet addiction, smartphone addiction, and problematic SNS use.-Attachment correlates with implicit narcissism and is associated with Internet addiction, smartphone addiction, and problematic SNS use. What the paper adds-Vulnerable narcissists who have anxiety attachment type are easy to fall into problematic SNS use.-Anxious attachment mediated the relationship between implicit narcissism and SNS addiction -Avoidant attachment did not mediate the relationship between implicit narcissism and problematic SNS use.