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Today, virtual social networks affect different dimensions of individual and social life of individuals and in the future they will play a much greater and more important role in life. The present study aims to study the positive and negative effects of virtual social networks from students' point of view medical and non-medical sciences universities of Gonabad city. This is a descriptive-survey study. The research population of the study population was Gonabad, a university student in the academic year of 2016-2017. To determine the sample size, 350 samples were selected using Cochran formula and selected by stratified random sampling from the research community. The data gathering tool in this study was a demographic questionnaire and a researcher-made questionnaire that was a measure of the effects of virtual social networks. The collected data were analyzed using SPSS version 20 software. networks social telegram with 96% and Instagram 60.9% were the most popular. communication with friends and acquaintances with an average of 16 and education with an average of 11, the most significant positive effects and anti-religious propaganda with an average of 17, and rapid formation and promotion The rumors with the average of 13 are the most negative effects of using these networks. There was also no significant difference between the viewpoints of students of medical and non-medical sciences universities in Gonabad. Facilitating virtual communication and education from the viewpoint of students is the most important opportunity to use virtual social networks. Also, anti-religious propaganda and the instigation of doubts, the formation and promotion of rumors are also a threat to such networks.