David Smahel, PhD, is a professor at the Institute of Children, Youth and Family Research, Masaryk University, Czech Republic. He directs the Interdisciplinary Research Team on Internet and Society (IRTIS), which researches social-psychological implications of the internet and technology. His current research focuses on adolescents and adults’ internet use, the online risks of children and adolescents, the construction of online identities and virtual relationships, and online addictive behaviour. He is editor of Cyberpsychology: Journal of Psychosocial Research on Cyberspace and has co-authored the book Digital youth: The role of media in development (2011, Springer). David has also published in several international journals such as Developmental Psychology, Cyberpsychology & Behavior, Zeitschrift für Psychologie, European Journal of Developmental Psychology and others. He is also author of several book chapters, such as in the Encyclopedia of cyber behavior, Encyclopedia of adolescence, Internet addiction: A handbook and guide to evaluation and treatment, and Gesundheit und Neue Medien.