Communication of non-profit organizations is based on the advertising of their own activities, whether it is about humanitarian or voluntary actions, education or raising awareness of some current social problem. Without adequate communication of such activities, the public will not have the opportunity to engage and actively participate or exchange opinions in order to solve a problem or to find common aspirations to a better society. The theme of this work is the importance and ways of communicating non-profit organizations through social networks in their immediate environment and the wider community. Through this work it is primarily presented main determinants of nonprofit organizations, their characteristics and role in society today. Special emphasis has been placed on associations and volunteer organizations and their role in Croatia. In addition, this work describes the term of social networks as well as their development over the years. The positive and negative aspects of communication on social networks are explored and explained in order to better understand the importance of social networks in today's communication. Since social networks have become the most significant media, the paper looked into communication of the DOBRA Association from Metković on social networks. The paper also explored the perception of members and the wider community of the DOBRA Association in the context of its communication and interaction on Facebook. The paper provides answers to whether the knowledge of the work and scope of the DOBRA Association is related to its activities on social networks and how much other communication channels have affected it. The research has ultimately resulted in recommendations for better communication of the DOBRA Association in its the immediate environment with the emphasis on communication through social networks.