The main aim of the thesis is to lay down recommendations on how there can be made a better use of the communication and the activities of the mobile network operators on social networks. The recommendations are based on an analysis of the mobile network operators’ behaviour on social networks by means of selected professional and analytical monitoring tools. The thesis is divided into four parts. The first one comprises a theoretical base in which the social networks are characterized and categorized. In this part, there are also several statistics which focus on the use of the social networks. Moreover, in this part the principles and ways of a specific social networks environment from the point of view of marketing are clarified. The mar...