Young people today use a wide repertoire of media in different contexts, which allows for new opportunities of social participation. In addition to activities in the political field, there are new media-related fandom activities. Concrete examples of this include soap operas that are not exclusively watched individually, but discussed by soap opera fans in fan forums and social networks. Moreover, the contents of series are rearranged by fans in new and creative ways and in some cases fans organize protest activities in order to save a soap opera that has been cancelled.This phenomenon of media-related participation activities of soap opera fans is investigated in this dissertation. The specific example of the German soap opera "Hand aufs Herz (Hand on Heart)" is examined in an exploratory case study with quantitative and qualitative research methods. The author wants to discover which media-related participation activities "Hand aufs Herz" fans perform on the Internet and which aspects of media literacy fans show in an informal learning context. Based on theoretical foundations of fandom research and concepts of media literacy and participation, a model of media-related participation activities of soap opera fans on the Internet is developed. After describing the design and implementation of the empirical study, the results of the study with "Hand aufs Herz" fans from 35 different nationalities are depicted, interpreted and then evaluated. The evaluation covers opportunities and challenges for students, parents, the television industry and suggested directions for future research.