The number of users of social networks is steadily increasing. They interact through social networks and influence each other in this way. It is becoming increasingly important for companies to engage in this area. How can the vast potential of social media be utilized? On which platforms does it make sense to have a presence? The author, Phillipp Thomas, provides an overview of Web 2.0, viral marketing, and the various social networks. Using the example of the browser game AT.LANT.IS, it is explained what measures can be implemented in the area of social media. The book is aimed at companies that want to engage in social media.