In recent years, Internet use in both professional and private contexts has increased significantly, most recently due to the introduction of Internet-enabled mobile devices. Previous studies suggest that a portion of users exhibit behaviors similar to those seen in addiction. However, representative and longitudinal data, which are necessary for a reliable and valid assessment, are scarcely available, primarily due to the novelty of the phenomenon. This project aims to examine the topics of usage, frequency, and dependence in relation to mental health.