Amidst rising concerns about mental health in adolescents, the role of social media (SM), particularly highly visual platforms such as TikTok, has become a growing focus of investigation. In the extant literature, conclusive evidence is limited by the aggregate analysis of very heterogeneous SM platforms. This systematic scoping review examines the relationship between TikTok and mental health in adolescents. Additionally, it aims to highlight potential interactions between typical developmental processes and the unique aspects of TikTok, exploring their relevance to mental health within this demographic. Following PRISMA guidelines, a systematic search across PubMed, Scopus, Web of Knowledge, and PsychINFO yielded 20 studies that met the inclusion criteria, encompassing a total of 17,336 subjects from 10 countries. The retrieved studies analyzed four main topics related to TikTok use, i.e., the overall impact on adolescents’ mental health, risk of problematic use and behavioral addiction, consequences on body image and self-esteem, and possible spreading of mental illness behaviors. While TikTok offers creative opportunities for self-expression and peer connection, the literature raises concerns about its potential negative effects on teens, such as lower life satisfaction, increased risk of “contagion” of certain psychiatric symptoms, and problematic usage patterns. Significant variations in study methodologies and outcome measures were observed. In the current era of evolving SM landscapes, a comprehensive approach informed by developmentally grounded research is critically needed to further understand the interplay between SM and adolescent mental health, providing insights for health authorities and policymakers.

Background: Moral development (MD) arises from the interaction of attachment, temperament, emotion regulation, and decision-making. Children and adolescents with Attention-Deficit/Hyperactivity Disorder (ADHD) frequently show impairments across these domains, suggesting increased vulnerability to disruptions in MD. However, the mechanisms linking ADHD to MD remain poorly understood. Methods: A systematic review was conducted according to PRISMA 2020 guidelines. PubMed was searched for studies published between January 2014 and November 2024 examining MD-related constructs, including moral reasoning, fairness, aggression, bullying, callous–unemotional (CU) traits, decision-making, and reward sensitivity, in individuals aged 0–18 years with diagnosed or subclinical ADHD. Due to substantial heterogeneity in study design, measures, and outcomes, a qualitative synthesis was performed. Results: Of the 2104 records identified, 23 studies met inclusion criteria. Insecure or disorganized attachment, difficult temperament, and emotional dysregulation consistently emerged as developmental risk factors for impaired MD. Hyperactivity–impulsivity and deficient inhibitory control were strongly associated with aggressive and antisocial behaviors. Children with ADHD demonstrated a pronounced preference for immediate over delayed rewards, altered decision-making in social contexts, and reduced sensitivity to positive feedback. CU traits and aggression were frequently identified as behavioral correlates of MD impairments, particularly in interaction with family adversity and comorbid externalizing conditions. Social dysfunction, including bullying involvement, peer rejection, and interpersonal difficulties, was common and contributed to elevated long-term psychosocial risk. Conclusions: ADHD is associated with multidimensional vulnerabilities in MD through intertwined cognitive, emotional, and relational pathways. Interventions targeting attachment security, emotion regulation, reward processing, and social skills may foster MD and reduce later social difficulties. Longitudinal and cross-cultural research is needed to clarify causal mechanisms and inform developmentally sensitive prevention and treatment strategies.

Background: Problematic social media use (PSMU) has been increasingly conceptualized as a form of behavioral addiction, characterized by loss of control and continued engagement despite negative consequences. Adolescents with psychiatric disorders may represent a particularly vulnerable group, yet clinical evidence remains limited. This study examined the prevalence of PSMU in help-seeking adolescents and investigated how psychological vulnerabilities influence social media (SM) engagement, platform selection, and content preferences. Methods: A cross-sectional study was conducted on 265 adolescents (12–18 years) undergoing psychiatric evaluation. Participants completed validated measures of PSMU (Social Media Disorder Scale-9) and perceived stress, along with items assessing screen time, platform usage, engagement style (active vs. passive), and content preferences. Diagnostic data were retrieved from clinical assessments. Results: PSMU prevalence was 14.4%, rising to 19.2% among adolescents with internalizing disorders. Female and gender-diverse adolescents showed significantly higher PSMU scores. PSMU was associated with greater screen time (OR = 2.41) and nearly threefold higher odds of intensive TikTok use. Overall, SM engagement was predominantly passive, particularly among adolescents with depressive disorders, while those with neurodevelopmental disorders more frequently engaged actively. Higher stress levels were linked to greater SM use, especially on TikTok and Instagram. Conclusions: PSMU appeared to be relatively prevalent among adolescents receiving psychiatric care, particularly those with mood and anxiety disorders and high stress levels. Findings highlight the importance of assessing PSMU in these groups of adolescents and analyzing qualitative patterns of SM engagement to identify at-risk youth and inform targeted clinical interventions.