Both adolescents and adults are now using the Internet more than ever. Evidence increasingly suggests that time spent online does not displace time spent doing other activities associated with health and well-being. Indeed, a recent longitudinal study of 14–24-year-olds (n = 719) found a positive relationship between moderate Internet use and participation in ‘real-world’ activities such as sports and clubs [6]. Because the Internet can be used through various media such as mobile phones or computers Internet use sometimes falls under the category of ‘screen-based sedentary behavior’. Although it is unclear how time spent specifically using the Internet relates to physical activity, a longitudinal study of 11–13-year-olds (n = 908) suggests that engaging in screen-based sedentary beha-viors such as computer use is not associated with less engagement in leisure-time physical activities [7]. Regard-ing social well-being, a review of the literature in 2009 supported the idea that communicating with friends through the Internet can increase adolescents’ social con-nectedness [8]. These and other studies emphasize the need to distinguish between the effects of different Internet activities (e.g., information gathering, communication) as well as specific aspects of Internet use that may be shared with other forms of media (e.g., screen time).