The vast majority of research on social media use (SMU) is focused on its negative effects while often disregarding that it can also help adolescents form and maintain a network of social relations and support. This study explores the possibility of predicting SMU intensity based on peer attachment dimensions (Trust, Communication, Alienation) and FoMO on a sample of adolescents (N = 557; M_age = 18.09; SD_age = _.275). The results show that Trust and Communication (merged in one dimension of Peer support) are positive predictors of SMU and that this effect is partly mediated by FoMO which was also found to be a positive predictor. Alienation was not a significant predictor in the first step of regression analysis, but it became significant upon the addition of FoMO. The indirect effects analysis showed that FoMO suppresses the effect of Alienation on SMU intensity - the stronger FoMO the smaller the effect of Alienation. To sum up, when there is trust and good communication in relationships with friends, but also Fear of missing out, there will be more intensive use of SM. In addition, although being alienated from friends can restrict the use of SM, this effect is diminished if there is Fear of missing out. Taken together, these results point to the role of peer attachment and FoMO in predicting the intensity of SMU which can be viewed not as a negative phenomenon but as a way of acquiring social capital and a means of preserving and maintaining already acquired social capital.

Today's generations of adolescents have grown up with information and communication technologies which have a significant place in their lives. One of the important issues in this context is the relation between the Internet and the mental health of adolescents. The first topic that this paper deals with, is the relationship between the use of the Internet and mental health, and the other is related to the planned use of the Internet for the purpose of improving wellbeing. The most common activity of young people on the Internet is social networking. Online social networks can positively affect wellbeing through facilitating self-disclosing and the availability of social support. Such findings from empirical research support the ideas of theories that emphasize the positive aspects of online relating. However, social networks (and online communication in general) can also have significant negative effects on the mental health of adolescents, if they are exposed to cyberbullying. The second topic of the paper is the planned use of the Internet for the purpose of improving mental health. To young people (and to members of other age groups, as well) online support groups are the most accessible nowadays, aimed at supporting a group of people with a common problem or life challenge. These forums are most often text-based and this kind of communication has a number of potential benefits for users. It is also possible to organize online interventions that promote mental health and prevent its deterioration. Research shows that online skill-based interventions can have a positive impact on adolescent mental health. The results of the online prevention interventions indicate the encouraging evidence concerning computerized cognitive behavioral therapy interventions and their impact on adolescent's anxiety and depression symptoms. Although it contains potentially negative aspects, the Internet has a positive significance and potential for the development of adolescents.

Online communication is ubiquitous in the adolescent culture. Beside numerous advantages of this kind of connection among people, there are also significant risks. The goal of this research is to examine the correlation between problematic online behavior and experience with certain social (parental mediation), cognitive (information disclosure) and personality factors (dimensions of self-evaluation and extraversion). The study included 339 adolescents aged 18 and 19 (135 boys, 204 girls). We examined online abuse, sexual behavior and sexual victimization; and these scales and a parental mediation scale were based on instruments used in contemporary research in these phenomena. The scale of information disclosure was constructed within the project of Safer Internet Centre Croatia, and dimensions of personality were measured by the subscales of the Big Five+2. The results of canonical correlation analysis conducted in this study support the idea that narcissism is important for engaging in problematic online behavior; the importance of extraversion was not confirmed. An idea concerning the importance of the cognitive factor – privacy protection – is also supported. An idea that is not supported by the results is the importance of parental mediation in the prevention of problematic online behavior, and a probable reason for that is the age of respondents. The most significant implication of these results is raising awareness of the personal information protection on the Internet.