Abstract. This work focuses on the analysis of online social networking services. We examine several formal definitions of various characteristics (numerical and structural) and introduce appropriate concepts, models and methods that could be useful for the analysis of information obtained from social networks. Preference analysis is proposed to be used to study interpersonal relations. Various modifications of Latané's dynamic social impact theory are proposed. The authors have studied techniques used to carry out psychological operations, and, as a result, have proposed several formal models. The paper briefly describes a software system that we have developed, which allows extracting, processing, analyzing and visualizing data from online social networking services. Our system has a data extraction module that can retrieve information from social networks such as Twitter, Facebook, and VKontakte.

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The paper describes the methods of comparison of the sentences in a natural language for estimation of their similarity. To solve this problem, it is possible to use the semantic-syntactical relations between words constructed by the software system Link Grammar Parser. The results of our research are planned to be used in information retrieval systems. The application of the methods here considered to studies of Turkic languages is briefly described.

Abstract. The paper gives the background and history of the foundation, in 1990, of the Institute of Informatics Systems, Siberian Branch, Russian Academy of Sciences (IIS SB RAS). The institute is rightfully considered the successor to the academic tradition of the Novosibirsk programming school created by Academician A.P. Ershov, head of the Programming Department with the Computing Center, Siberian Branch, USSR Academy of Sciences . Today, Ershov's programming school, whose establishment dates back to the 1960s, continues to develop. In the 1990s, it was transformed into a separate entity, the Institute of Informatics Systems SB RAS. Here, theoretical studies into the topics outlined by A.P. Ershov, his colleagues and disciples are developed and put into practice. The IIS SB RAS is the only research institution in Siberia that focuses on computer science. The genesis of the programming theory and its current development by A.P. Ershov's colleagues and successors have been traced. The IIS SB RAS and Novosibirsk school of programming base their activities on the technological and methodological culture of system engineering, program design and development, which also applies to software engineering. The Novosibirsk programming school as a research and educational phenomenon does not concentrate solely on the good results in theoretical and practical programming. The researchers of the IIS SB RAS actively support social projects on education and informatisation of humanities.