The aim of the study was to find out the effect of use of social networking sites (SNS) on the academic achievement of post graduate students. The sample was selected randomly from university and college located in different areas of Jammu district. In this study, Quartile Deviation and Pearson Product Moment method were used for correlation. A self-prepared scale was used to gather data about social networking sites usage of post graduate students. Descriptive survey method was employed in this investigation. The value of correlation was found out to be low which is not significant, so there is no significant relationship between scores of attitude towards S NS usage and scores of academic performance of low, middle and high achiever post graduate students .