This diploma thesis deals with a new trend in the corporate sector -- social networks. These in fact have become a phenomenon due to its growing popularity in recent years. The aim of this thesis is to introduce the social networks in a broader context -- especially the analysis of milestones of social networks. Further comparison of selected social networks from the perspective of business alias what options the company offers a social network for your presentation with access to user data (Social CRM). The third part of the aim of this work is to analyze the critical factors in the integration of social networks into the enterprise information system. The work can be divided into the descriptive (Chapters 2-4) and the practical (Chapters ...