Internet has become an integral part of ecosystem that influences the development and adaptation of individuals. Many people meet social needs on the Internet (CNNIC, 2021). However, the Internet becomes a double-edged sword due to the negative phenomenon, such as cyberbullying (Wei et al., 2022). Cyberbullying is generally defined as using electronic or digital media to repeatedly inflict harm on others who are unable to defend themselves (Tokunaga, 2010). Characteristics of cyberbullying include a large number of potential audiences, beyond time and space, and the invisibility of perpetrators (Kowalski et al., 2014). Due to the characteristics, cyberbullying victimization is considered to be a greater risk for psychological and behavioral adaptation than traditional bullying victimization (Sticca & Perren, 2013; Tokunaga, 2010). Researchers found that cyberbullying can cause many psychological adaption issues (e.g., anxiety, depression, etc.) (Fisher et.al., 2016). Therefore, this study focuses on the association of cyberbullying victimization and mental health and its underlying mechanism.
Strong threats of social relationships are important factors influencing mental health (Fiorilli, 2019; Nepon et al., 2021). Cyberbullying victimization is one of strong interpersonal stressors due to its repeated and imbalanced character. Cyberbullying victimization can cause individuals to feel rejected and isolated (de Bruyn et al., 2010), and their need to belong is difficult to meet. At the same time, the characteristics of cyberbullying (e.g., repetitiveness and anonymity) may cause individuals to feel unpredictable and uncontrollable to the external world, leading to helplessness and hopelessness, which are important predictors of depression (Henkel et. al., 2002). Empirical studies have showed that cyberbullying victimization is positively predicted many psychological problems (e.g., anxiety, low self-esteem, depression, etc.) (Fisher et al., 2016; Gámez-Guadix et al., 2013; Gao et al., 2021).
Prior studies have concerned traditional bullying and cyberbullying in adolescents and adults (Brewer & Kerslake, 2015; Şahin, 2012; Okumu et al., 2020; Tsitsika et al., 2015; Ttqha et al., 2020), and there is limited research on cyberbullying victimization among children. However, it is worrisome that children are vulnerable to cyberbullying victimization because they have less experience in dealing with negative online events (compared to adolescents and adults). Meanwhile, the adverse effects of early adversity may be last throughout the life span (Green et al., 2010). Depression in childhood may trigger developmental and adjustment problems in adolescence and adulthood (Smith, 2014; van Dulmen & Goossens, 2013). Thus, the purpose of the present study is to explore the association between cyberbullying victimization and depression in children. We hypothesize that depression is predicted by cyberbullying victimization positively in children (H1). In addition, the mechanism underlying cyberbullying victimization and depression is one of the research focus. Understanding the underlying mechanisms can provide a basis for intervening in the harmful effects of cyberbullying victimization. Therefore, the present study aim at further exploring how cyberbullying victimization affects depression and potential individual differences in children.
1.1. Self-perceived social competence as a mediator
Self-perceived social competence is also known as social self-efficacy (Galanaki & Kalantzi-Azizi, 1999), which generally defined as a belief in one's ability to perform competently in a social situation (Vickerstaff et al., 2007). Negative interpersonal experience may impair social self-perception, because the building of social self-perception relies on interpersonal interactions and social feedback (Cole et al., 2014). Especially, children's self-evaluation is developmental and vulnerable to social context and interpersonal experiences (Van der Aar et al., 2018). Experiencing adverse interpersonal events (e.g., cyberbullying) may produce negative feelings of unacceptability and worthlessness (Hua et al., 2019). These negative feelings may produce self-doubt and self-denial, as well as pessimistic beliefs about social competence. In addition, longitudinal study also found that cyber victimization predicted negative self-cognition (Cole et al., 2016). Therefore, cyberbullying victimization may have detrimental influences on self-perceived social competence.
As social aspect of self-efficacy, self-perceived social competence is closely related to individual adaptation (Sakz et al., 2020). When individuals who perceive themselves as having poor self-perceived social competence may feel that they are socially incapable. According to the self-determination theory (Deci & Ryan, 2000), unmet basic psychological needs of individuals (e.g., sense of belonging and competence) may lead to psychological adjustment problems. Social self-perceived social competence is related to belonging. For children in school, belonging is an important psychological need (Over, 2016). Individuals with low self-perceived social competence may feel less competent in maintaining harmonious interpersonal relationships and dealing with interpersonal conflicts. These perceptions may produce helplessness and despair, which may further lead to depression (Abramson et al., 1989). In addition, studies found that negative self-cognition significantly predicted outcomes of maladaptation, such as loneliness (Haugen et al., 2013; Sakz et al., 2020; Zhang et al., 2014) and depression (Sowislo & Orth, 2013). Thus, self-perceived social competence may negatively predict depression.
According to the stress process model (Pearlin et al., 1981), stressors (e.g., cyberbullying victimization) may erode positive cognitive evaluation (e.g., self-perceived social competence) and then leave one especially vulnerable to experiencing symptoms of stress (e.g., depression). Besides, studies showed that children’s social self-perceptions mediated the effect of peer difficulties on internalizing problems (Ladd & Troop-Gordon, 2003; Spilt et al., 2014). Thus, it might be assumed that cyberbullying victimization predicts depression through the mediating role of self-perceived social competence (H2).
1.2. Personality trait of optimism as a moderator
According to diathesis-stress theory of depression, the interaction between the environment and the individual jointly determines mental health (Monroe & Simons, 1991). Positive personality traits (e.g., resilience, growth mindset, mental capital) are protective factors against stressful environments and can reduce the occurrence of psychological problems (Chun et al., 2021; Niu et al., 2020; Tucker et al., 2013). Optimism as a positive personality trait is a protective factor for an individual's mental health. Thus, it is important to explore optimism role in the relationship between cyberbullying and depression.
Optimism is a generalized tendency toward positive expectations of the future and life engagement (Scheier & Carver, 1984; Tucker et al., 2013). As a positive personality trait, optimism contributes to personal adaptation and individual life satisfaction (Mäkikangas et al., 2004; Mens et al., 2018). Optimists are biased toward positive information and can look at the positive aspects in the face of stress (Segerstrom, 2001). Positive information can promote enhanced positive emotions and hope. Besides, optimists tend to employ positive cognitive strategies (e.g., cognitive reappraisal) and coping strategies (e.g., problem-solving coping strategies) to mitigate the effects of adversity on negative psychological outcomes (Carver et al., 2010; Nurmi et al., 1996; Puskar et al., 1999).When faced with cyberbullying victimization, optimists accept their situation realistically and solve problems in an adaptive way. Furthermore, optimists also have greater self-confidence and perseverance in the face of cyberbullying victimization (Carver et al., 2009). That is, optimism can be beneficial in reducing vulnerability to depression by increasing positive thoughts, adaptive coping, and perseverance. In addition, cross-sectional and longitudinal studies found that optimism moderated the relation between various stress (e.g., perceived psychological stress, job stress and coronavirus stress ) and depression (Banerjee, 2012; Romswinkel et al., 2018; Arslan & Yıldırım, 2021).Thus, it might assume that optimism moderates the direct effect and indirect effect of cyberbullying victimization on depression. Compared with high optimism, cyberbullying victimization could directly predict depression and indirectly predict depression through self-perceived social competence in low optimism (H3).
In summary, it makes sense to incorporate self-perceived social competence and optimism in the same conceptual framework. According to the stress process model (Pearlin et al., 1981) and the diathesis-stress theory, the undesirable impacts of stressors (e.g., cyberbullying victimization) can be mediated by cognitive factors (e.g., self-perceived social competence) and moderated by personality traits (e.g., optimism). Thus, this study focuses on the relationship between cyberbullying victimization and depression, and the mediating role of self-perceived social competence and the moderating role of optimism.