Since the first social media sites appeared, the relationship between social media use and narcissism has been a topic of study. According to research, social media use can cause narcissism on the one hand and increase social media use on the other, with a potentially mutual effect between the two. The narcissistic culture is currently being replicated, and narcissism is being encouraged on social media. Social media sites have been found to be an ideal environment for meeting narcissistic needs, and narcissistic behaviours are rewarded. Furthermore, their narcissistic attitudes and behaviours in real life are mirrored in their social media behaviours, and their narcissistic levels rise even further. While numerous meta-analyses have been conducted to synthesise empirical evidence on the relationship between narcissism and typical online behaviours (e.g., uploading photos and usage frequency), evidence on the relationship between narcissism and Problematic Social Media Use (PSMU) has yet to be systematised. The current study is a systematic review on the subject.