This chapter explores the convergence of various digital technologies and their potential impacts on problematic online behaviors. Incorporation of gaming elements into many online activities (e.g., gambling, on-demand video streaming, social media, and pornography) has created concerns about problematic use, particularly among youth). We review the current state of knowledge, which suggests that problematic engagement in different activities represents distinct conditions. Nonetheless, despite their apparent distinctiveness, online addictive activities have shared risk factors, including personality factors, comorbid psychopathological symptoms, cognitive processes, and neurobiology. A common approach to prevention is therefore sensible, even if treatment of problematic cases should follow individualized approaches. Approaches actively involving parents are encouraged. We call for expanded research on the impact of specific design features of online activities on problematic behavior and risk, particularly relating to gamified activities. Longitudinal research is needed to better understand the use and impacts of online activities across developmental stages. Given the limited understanding of long-term impacts and the dynamic nature of related technologies, greater evidence is needed to inform policy and regulation relating to exposure of children and adolescents to content and activities that might in some cases promote problematic behaviors.