This thesis investigates the relationship between social media and Cluster B Personality Disorders: Borderline Personality Disorder, Narcissistic Personality Disorder, Antisocial Personality Disorder, and Histrionic Personality Disorder. This research builds upon previous findings by examining specific negative social media motivations and behaviors, such as excessive use and negative motivations, in relation to Cluster B Personality Disorders. Participants completed the McLean Screening Instrument for Borderline Personality Disorder (MSI-BPD; Zanarini et al., 2005), The Short Dark Triad (Jones &Paulhus, 2014), Antisocial Process Screening Device (Frick & Hare, 2002), Self-Test Histrionic Personality Disorder (Olivardia, 2022), and Motivations for Social Media Use Scale (MSMU; Rodgers et al., 2020). These instruments assess callous-unemotional traits, narcissism, impulsivity, attention-seeking behaviors, erratic behaviors, and motivations for social media use. The results indicate a significant positive correlation between extensive social media use and higher tendencies toward Cluster B Personality Disorder traits, with specific social media motivations strongly linked to distinct aspects of these disorders. This study enhances understanding of the psychological correlates of excessive social media use.

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