Social media plays a significant role in adolescents' lives, with both positive and negative effects. Implementing interventions to mitigate the negative aspects and enhance the positive ones could improve adolescents' well-being. Unfortunately, there is a scarcity of evidence-based interventions available. To fill this gap, we have developed a school-based program based on combining evidence-based and consensus-based approaches, incorporating input from adolescents, school personnel, researchers, and municipal advisers. This paper describes the program's content and principles, and presents the results from a pilot evaluation, which assesses feedback from pupils and teachers, thereby informing potential enhancements and the program's overall significance. The intervention description encompasses theoretical perspectives, behavior change techniques, and procedural details. Pupils (n = 266; 16+ years) evaluated the program concerning satisfaction, relevance, importance, and usefulness through a questionnaire. Additionally, exploratory focus group interviews were conducted with seven teachers and eleven pupils to gather their perspectives on the program's relevance, impact, and potential changes to the theme-based teaching. Results from the pilot showed an average score of 7.3/10 for overall satisfaction with the program. Sub-questions assessing perceived relevance, engagement, and usefulness averaged between 6.7 and 7.5. Gender differences were observed, with boys tending to rate the program lower than girls. In focus group interviews, the pupils expressed increasing awareness of their own and others' social media use, that the topic was important and exciting, and that the program generally worked well. The pupils' evaluation indicates the need for this kind of program described in this study.