Background: TikTok, a social media application, has gained tremendous popularity in recent years, with a broad spectrum of users from all ages, different countries and cultures. However, major concerns in the field of mental health related to the use of such platforms have consequentially emerged. This particular research aimed to analyse the usage patterns associated with the social media platform, TikTok, and its cascading psychological effects among young Mauritian adults. Methodology: The cross-sectional study adopted a quantitative approach with a sample of 400 Mauritians meeting the inclusion criteria. A self-reported questionnaire examining self-esteem, Fear of Missing Out (FOMO) and mental health determinants was designed and administered primarily through online mediums. Findings: 30.5% of the participants used TikTok for 1 h to 2 h, while 12.3% used it for 2 h to 3 h daily, and the most prevalent reason for TikTok use was leisure (73.5%). Adverse psychological effects, characterised by pessimism (33.3%), restlessness (35.1%), uselessness (39.8%), anxiety (38%), depressive behaviours (36.5%), lower self-esteem (17%), and FOMO (41.7%), were depicted among the sampled participants. An increase in FOMO led to lower self-esteem (rs = −0.326, p < 0.05), heightened anxiety (rs = 0.467, p < 0.05) and a potential increase in depressive symptoms (rs = 0.338, p < 0.05). There was a significant difference in anxiety levels when perception of self-directed negative comments was assessed (U = 11,852.500, z = −4.808, p < 0.05). Conclusion: This study empirically revealed that the general use of TikTok in itself appears to be non-problematic; rather, its unhealthy excessive usage triggers deleterious mental health among TikTok users. The findings also pointed towards sensitization measures and psychoeducation towards the appropriate use of social media platforms such as TikTok.
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