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Over the past decades, the Internet has grown to be a powerful medium, regularly used by 3.4 billion people (Internet World Stats, 2015), e.g., for purposes of communication, information seeking, and recreation. Certain applications for interpersonal communication, e.g., instant messenger and social network sites, are very popular and frequently used amongst the younger population (van den Eijnden, Meerkerk, Vermulst, Spijkerman, & Engels, 2008). According to Castiglione (2008), the Internet becomes a source of self-medication for younger users, especially to develop their identities or to establish relationships. Even if the Internet is used as a beneficial tool, an abnormal use could be entailed with negative consequences for oneself and others over the long term (Guan & Subrahmanyam, 2009; Livingstone, 2008). Past research indicated a high number of possible risks associated with dysfunctional Internet use (DIU), including intended and unintended experiences e.g., in pornographic or hateful online content, problematic harmful contacts via grooming or harassment as well as privacy risks (Mitchell, Finkelhor, & Wolak, 2003; Ybarra & Mitchell, 2008). In the following section, we briefly discuss the phenomena of Internet addiction (IA) and cyberbullying (CB) as two serious problems for adolescents as well as university students (Kowalski, Giumetti, Schroeder, & Lattanner, 2014; Kowalski, Limber, & Agatston, 2012; Pontzer, 2009; Rumpf, Meyer, Kreuzer, & John, 2011; Siomos, Dafouli, Braimiotis, Mouzas, & Angelopoulos, 2008; Slonje & Smith, 2008).