 Procedure Participants will be recruited through notes in different social media and the website of the project that will be linked to different fora which are known to engage adolescent girls. After obtaining informed consent, participants will be asked to download the app used for the study. Participants will then be asked to respond to the set of questionnaires pre-intervention assessment using a secure plattform, and they will be interviewed. They will then be asked to await feedback, and if included allocation to a group. Participants with significantly high scores on measures of depressive symptomatology or potential diagnosis of dysmorphophobia, eating disorders will be advised to seek professional help, and receive guidance on how to do it. The rest of the participants will be randomized to the study arms. They will then receive further information about their participations and use of the app. 