Despite the relevance of social innovations in the sustainable development, little is known about the drivers that help to spread them. Innovative ideas are developed to meet the needs of local communities and therefore often remain at a regional level; nevertheless, diffusion and scaling are necessary in order to lead to a societal change. This thesis analyses the case of Suspended Coffees, a successful diffusion of a social innovation in Germany. The research focuses on businesses adopting the social innovation to examine the drivers of diffusion. 24 interviews with business owners and two in-depth expert interviews with the German coordination body were conducted. The results illustrate (1) the existence of social needs, (2) the strong personal motivations of adopters, and (3) the compatibility of the innovation with adopting businesses and the social ecosystem, as main drivers of the diffusion. The study thereby expands the limited research in the field of the diffusion of social innovations.