The present study was conducted to explore the impact of Usage of Social Networking Sites on PG students of Central University of Punjab. The objectives of the study were to analyze the level of usage of social networking sites and comparing the usage of SNS between male, female, science and humanities PG students of Central University of Punjab. The total number of 200 students were selected by using stratified random sampling technique for the collection of data. Data were collected by using self-made questionnaire. The study found that the maximum number of PG Students of Central University of Punjab comes under moderate level of usage of Social Networking Sites. It was also revealed that there is no significant difference in the usage of Social Networking Sites among PG students of science and humanities streams. Furthermore there is no significant difference between usage of Social Networking Sites among male and female PG students of Central University of Punjab.