This article reviews Viber application Usage by the Students at Ferdowsi University of Mashhad (FUM), Islamic republic of Iran and its social effects on the users. Although social media applications are common worldwide, using some of social media are not encouraged in Iran and are sometime associated with negative attitude in formal circles. There is sometimes doubt that the use of such applications may result negative effects for the users. Therefore, Viber application Usage by Students and its positive social effects in Iran is debatable. This review includes description of the rate, kinds, patterns and the positive social effects of Viber usage on the social identities and relationships of the students. The method was survey and the population involved all of graduate and undergraduate students at FUM in spring semester 2015. Sample size included 151 students of all faculties and branches who were selected by using disproportionate stratified random sampling technique.Results showed that more than half of the students had installed Viber application no later than one year ego. Students were differed by the time and place of usage. Viber usage had many positive social effects on the students’ identities and relationships in the virtual as well as the real world, while the former world had reinforced the latter. More usage was motivated by the students who were achieving welcome, esteem and confirmation by other users in Viber space. Also, Viber usage extended social realms of the students in many kinds of classmate, scientific, occupational, leisure activity, and artistic groups. Researcher concluded that Viber is important social media for improving social interactions and social development in Iran and there is no worry.

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