Social media based on information and communication technology with Internet-based infrastructure represents an important element of social and business environment. Social media in the business environment represents the engagement and participation of the community, new ways and ideas that are source of lasting competitive advantage and business strategy in today's world. The subject of this diploma thesis is the introduction of social media into an organization with an emphasis on corporate social networks. Corporate social networks enable monitoring and improving communication and information flow within the organization. This paper presents summarized history of social media and its importance in business world. It gives an overview of the theory of organizations and the analysis of the organizational structures. The concept of social organization is introduced as an upgrade of the organizational structures. Social organizations use social media for mass collaboration. Corporate social networks are described as the most widely used social media in corporations and an introduction to the analysis of corporate social networks is given. Organization's network profile is analyzed through case study.