Social networks are popular among people these days. Especially among students. Today social networks has an important role in human's life.Investigate the pattern of social network usage among students in Zahedan University of Medical Sciences. This cross-sectional study was conducted on 242 students ofZahedan University of Medical Sciences. Data were collected through a checklist designed by the researchers. Then the data were analyzed by SPSS v.19 through descriptive statistics and chi square test. The mean of age was 21.34±1.97 among respondents. 75 were in semester 1 up to 3 (33.5%), 80 were in semester 4 up to 6 (35.7%) and 69 were in 7 up to 12 semester (30.8%).There was a significant relationship between kind of device used for getting online and how much time which students were online (p=0.02). 104 of respondents were member of social networks before coming to university (46.4%), 74 got member of them in first year of entering university (33%) and 46 got member of them after first year of entering university (20.5%). Almost all of the respondents were member of social networks. What's app had the highest number of members among students. Given that social networks are a recent technology, conducting studies on other effects of this technology on student's life such as mental health, life quality and educational burnout.
