The thesis, following the technological advancement, analyses the use of social networks as entrepreneurial marketing tool, providing new business opportunities, as well as the creation of innovative promoting strategies on the virtual environment, and generating fresh commercial opportunities for the companies. The review chapter addresses themes such globalization and network society, conception of alternative medias and the virtual space as form of communication, digital marketing focused on social media. The empirical part of the research investigates two companies located in the city of Rio de Janeiro from different business sectors, which use digital marketing strategies as business tools. The purpose was to compare these two companies marketing approaches on the social medias, having the assistance of their own designers, and we reached a satisfactory result, indicating the majority of the responses were in accordance the theoretical review.