Science communication can be understood as all forms of communication focusing on scientific knowledge and scientific work, both within and outside institutionalized science, including its production, content, use and effects. It encompasses internal and external communication, science journalism and public relations and is thus directed to and by scientists as well as non-scientists, using one-way and dialogue-oriented forms to communicate between science and the public sphere. The present article provides an overview of content analysis of the main communicators of science communication: scientists, universities and scientific institutions and non-scientific, alternative science communicators.