The availability of the Internet, online Social Networks and mobile devices, associated consequential increase of personal images published online and the rapid developments within the fields of computer vision and image processing lead to open questions: -What are the possibilities for the analysis of personal images published online using currently available technological means?- and -Is there awareness in today's society, especially among children and teenagers, for these possibilities, for their exploitation, resulting risks or consequences and hence for a responsible handling of their personal pictures online?- The -digital natives- generation is characterized by their skillful use of new media but also by their lack awareness concerning benefits, risks and responsibilities induced by the handling of personal data. Examples for questionable trends are -sexting- or -cyberbullying-. Further, once published, digital images can spread quickly over the Internet and are difficult to be removed. Consequences of these trends can be disastrous for the involved persons, yet pupils still lack a critical evaluation of their own behavior. This work is focused on the possibilities, risks and impacts of the application of computer vision and image processing technologies within the context of online available pictures as well as the acquisition and processing of large amounts of unconstrained image datasets. It aims at developing an interdisciplinary project concept with the following characteristics: It combines state of the art research of sociology and computer science to develop a profiling software tool and to collaboratively implement the project. The overall objective is to improve media literacy and the awareness among children and teenagers for a responsible handling of their own data online. Furthermore, it includes current related work focusing on media use and media education as well as image analysis for facial attributes within the context. This thesis focuses on: How do children and teenagers use the Internet and Social Networks within the context of image data? Where are their personal pictures published online and how can they be accessed and acquired? Image Processing in unconstrained environments and large datasets: State of the art approaches within the context of Face Detection, Recognition or retrieval of similar faces is researched. It includes current challenges and pitfalls within the context as well as application possibilities within the context of an image-based person-profiling tool. The Profiler: Design and parts of implementation as well as evaluation of an interdisciplinary project concept aiming at improving media literacy and awareness for the benefits, responsibilities and consequences evolving of the use of the Internet and Social Networks with focus on image-based data. Target user group comprise children and teenagers of age 10 onwards. Main focus is the design, parts of development and evaluation of an image-based person-profiling software implemented collaboratively by the project team, which creates profile-style descriptions of individuals based on acquisition and content-based analysis of online available images. This results in the following methodology: The starting point is a comprehensive state of the art research on Internet- and media use of children and teenagers of age 10 onwards as well as related projects and initiatives aiming on media education and critical media use among them, Face Recognition in unconstrained environments and face databases and Social Network Analysis. This is followed by the design of the project approach and the profiling tool as well as its collaborative implementation. In parallel, workshops are designed and implemented for the pupils addressing overall aim and covering relevant topics, such as image processing, legal aspects, scientific work and studies, as well as a user test to evaluate and later-on optimize the software. Within the context of this work the evaluation is focused on the implementation of the overall project, the user interface and usability based on the user tests as well as an impact assessment with respect to the awareness of the participating children and teenager based on the conducted research and workshops.