The paper presents the social network as a global communications phenomenon. We define the concept of social networks, given their historical account and analyze the most popular social networks. Stresses the life cycle of social networks and their marketing opportunities. It is also the concept of corporate performance through social networks and that all security risks exposed to social networks. It also describes the market of sports supplementation and healthy eating, and the emphasis in the work placed on the study of the effectiveness of sports supplementation and promotion of healthy eating through social networks on concrete example Companies Ltd. At the end of the work is carried out a comprehensive conclusion.