**Sina Ostendorf, Elisa Wegmann and Matthias Brand**

Problematic Social-Networks-Use in German Children and Adolescents—The Interaction of Need to Belong, Online Self-Regulative Competences, and Age Reprinted from: *Int. J. Environ. Res. Public Health* **2020**, *17*, 2518, doi:10.3390/ijerph17072518 . . **311**
