Diploma thesis deals with social networking sites and their use in education. Thesis is divided into two general parts. The first part deals with theory of learning; Bloom's taxonomy of educational objectives and new educational theory based on learning in networks -- Connectivism. After that thesis focuses on the definition of social networking sites, introduction of some of the best known social networking sites and examples of their use in foreign and domestic educational practice. The second part of the thesis is concerned with a practical use of chosen social networking site Wall.fm in classes of Web 2.0 and Social Networking Services course at the University of Economics, Prague. One of the parts is devoted to the survey among students of the course regarding the feedback on the use of social networking site in classes. The author then offers recommendations and suggestions for the use of the social networking site in Web 2.0 and Social Networking Services course in the upcoming semesters.