Katharina Kern examines the use of the social network Facebook in the event communication of marathons in the D-A-CH region. She derives recommendations for action that are intended to enable organizers to use Facebook more purposefully and thus more efficiently and successfully in the future. Marathon organizers are continuously advancing the expansion of their social media presence and are trying to create a competitive advantage over their rivals. The use of social media in event communication offers organizers a variety of new opportunities and chances to increase the visibility of their events, get closer to their target audiences, and strengthen the connection with them.