The project “Peer-Sharing” focuses on innovative online-platforms, which act as an intermediary for peer-to-peer (consumer to consumer) lending, buying or swapping of products or services. At this point digital peer-to-peer sharing is a niche phenomena, but its dynamic development has been considerable. So far its social-ecological potential has been neglected by research. Here the project ties in. Its goal is to study the ecological effects of product sharing over the internet as well as the motivation and barriers of consumers to join. Also it examines the factors which determine the stability and diffusion of peer-to-peer sharing. In living labs and together with four peer-to-peer sharing platforms (Wimdu, Kleiderkreisel, Drivy und flinc) the following research is being conducted: business model- and governance analysis, empirical research of consumer behavior, life cycle assessment and capability evaluation. Further more the project cooperates with Ouishare, an international sharing-network and Utopia, an online community for sustainable consumption to establish a thorough exchange with suppliers and users. Events with discussion panels will activate other stakeholders for this topic, especially policy makers and the civil society.