The popularity of Social Networking Sites such as Facebook, Snapchat or Instagram has fueled questions on the correlates and consequences of intense Internet use. In a series of cross-sectional and longitudinal studies, theoretical pieces, and meta-analyses my colleagues and I have tried to answer some of the related questions…

Gnambs, T., Stasielowicz, L., Wolter, I., & Appel, M. (in press). Do computer games jeopardize educational outcomes? A prospective study on gaming times and academic achievement. Psychology of Popular Media Culture. [pdf]

Appel, M., Schreiner, C., Weber, S., Mara, M., & Gnambs, T (2018). Intensity of Facebook use is associated with lower self-concept clarity: Cross-sectional and longitudinal evidence. Journal of Media Psychology, 30, 160-172. [pdf]

Gnambs, T., & Appel, M. (2018). Narcissism and social networking behavior: A meta-analysis. Journal of Personality, 86, 200-212. [pdf]

Marker, C., Gnambs, T., Appel, M. (2018). Active on Facebook and failing at school? Meta-analytic findings on the relationship between online social networking activities and academic achievement. Educational Psychology Review, 30, 651-677. [pdf]

Weichhart, G., Stary, C., & Appel, M. (2018). The Digital Dalton Plan: Progressive education as integral part of web-based learning environments. Knowledge Management & E-Learning, 10, 25–52.

Gnambs, T. & Appel, M. (2017). Is computer gaming associated with cognitive abilities? A population study among German adolescents. Intelligence, 61, 19-28. [pdf]

Appel, M. (2016). „Immer online, immer allein?“ – Zu den Auswirkungen des digitalen Wandels. In W. Lenhard (Hrsg.), Verhaltensstörungen im Jugendalter: Ausgewählte Determinanten und Phänomene (S. 58-65). Heidelberg: Springer.

Appel, M. & Schreiner, C. (2015). Leben in einer digitalen Welt: Wissenschaftliche Befundlage und problematische Fehlschlüsse. Stellungnahme zur Erwiderung von Spitzer (2015). Psychologische Rundschau, 66, 119-123. [pdf]

Appel, M. & Schreiner, C. (2014). Digitale Demenz? Mythen und wissenschaftliche Befundlage zur Auswirkung von Internetnutzung. Psychologische Rundschau, 65, 1-10. [pdf]

Appel, M., Stiglbauer, B., Batinic, B., & Holtz, P. (2014). Internet use and verbal aggression: The moderating role of parents and peers. Computers in Human Behavior, 33, 235-241. [pdf]