Modern trends in development of information and communication technologies change many aspects in the process of education: from the role of participants to the forms and methods of knowledge delivery. ICTs make it possible to develop students' creative potential. The emergence of online social groups was an important event in the sphere of communication but with time they began to be used by both teachers and students not only for communication, but also to achieve learning goals. Without any doubt, skillful use of social networks allows teachers to communicate with students at modern technological level, make classes more attractive and effective. An efficient teacher can prove that social networks are not only means of entertainment and communication with friends but are a working tool. The main aim of foreign language teaching is students' communicative activity or practical use of a target language. The teacher is to activate every student's activity in the process of learning, make situations for their creativity. The main objective of foreign language teaching is to educate an individual, who is able to communicate, continue education, including self education. Different theories lay the basis for the study of social networks' influence on different aspects of human activity and, particularly, education. The main theories are sociocultural theory and social constructivist theory. According to sociocultural theory, man is an integral part of the world they live in, so students are not independent in their activities. Social constructivist theory recognizes that students act in a certain environment, which under certain conditions enlarges their practical knowledge. These theories are focused on the effect of social interaction, language and culture in the learning process. Thus, theoretical basis proves positive effect of social networks, namely, they enhance substantial interaction in the educational environment of social groups as well as are directed at strengthening the values, exchange of opinions and experience with a practical orientation.