There are five identified types of Internet addiction as identified by Dr. Kimberly Young; They include, cybersex addiction (e.g. adult chat rooms, cyber-porn), cyber-relationship addiction (e.g. social networking, newsgroups that replace real life friends/family), net compulsions (e.g. online gambling, cyber-shopping, trading), information overload (e.g. compulsive web surfing, “Netflix binges” youTube) , and computer addiction (e.g. obsessive computer video game playing, programming aspects of computer science).
There have been a handful of studies that have reported the prevalence of IGD using nationally representative samples. The prevalence rates reported were 8.5% of American youth aged 8–18 years (Gentile, 2009), 1.2% of German adolescents aged 13-18 years (Rehbein, Kliem, Baier et al., 2015), 5.5% among Dutch adolescents aged 13-20, and 5.4% among Dutch adults (Lemmens, Valkenburg & Gentile, 2015), 4.3% of Hungarian adolescents aged 15-16 years (Király, Griffiths, Urbán et al., 2014), 1.4% of Norwegian gamers (Wittek, Finserås, Pallesen et al., 2015), and 1.6% of European youth from seven countries aged 14-17 years (Müller, Janikian, Dreier et al., 2015). Only the Norwegian study surveyed gamers.