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Description: Social networks like Facebook or Instagram are widely used. With the inclusion of gaming disorder in the ICD-11 as a disorder due to addictive behaviors, the problematic use of social networks is discussed as one further specific type of Internet use disorders. The I-PACE (Interaction of Person-Affect-Cognition-Execution) model provides a theoretical framework describing key concepts and their interactions likely involved in the development and maintenance of addictive behaviors. Implicit cognitions such as implicit associations linked to automatic processing and approach tendencies may override the control system by exacerbating goal-directed inhibitory processes. Use expectancies refer to subjective thoughts regarding concrete effects of drug intake or of a specific behavior. These expectancies might be experienced explicitly or implicitly and are likely based on underlying cognitive processes. After experiencing positive outcomes, this could result in positive (implicit) associations and in the experience of gratification and compensation of subjective needs. Studies have already demonstrated the relevance of implicit cognitions in substance-use disorders (e.g., tobacco-use disorder), as well as in gaming disorder and pornography-use disorder. However, studies investigating implicit cognitions in social-networks-use disorder are lacking. Furthermore, there is empirical evidence underlining the relevance of use expectancies in tobacco-use disorder and social-networks-use disorder, but no research has investigated potential interactions with implicit cognitions and the experience of gratification and/or compensation. This project aims at investigating the relevance of 1) implicit cognitions upon confrontation with addiction-related stimuli, 2) the experiences of gratification and compensation when using online social networks, and 3) use expectancies in social-networks-use disorder and tobacco-use disorder. It will be the first to compare individuals with social-networks-use disorder and individuals with tobacco-use disorder. The project will include four groups: individuals with 1) social-networks-use disorder, 2) risky use of social networks, 3) non-problematic use of social networks, and 4) tobacco-use disorder. Besides the surveys and structured interviews for the diagnostics and the experimental and neuropsychological tasks of the core battery, an Implicit Association Test with addiction-related stimuli and an online application for data-tracking assessing gratification and compensation within the two weeks after assessment will be administered. This project is part of the research group FOR 2974. See project (ACSID) and ACSID Homepage: https://www.uni-due.de/for2974/index.php