In the world of 21st Century, where Internet is ruling all over the world, everyone has now been dependent on Digitalization. With the advancement in technology, the standard of living has been changed. Every do’s & actions in our life is just a single click away from us. Now, Social Networking itself plays a most important part in our daily routine. It provides a huge platform for its users. The users find it convenient and easy to have communication with each other from one corner to other corner of the world. Social Networking Sites is used by every age of people either for their entertainment, communication, social purpose, professional purpose, academic purpose. Use of these Social Media application is affecting in both good and bad ways. Mainly, youngsters and students are getting addicted to it. Young generations are spending most of their time in creating profiles, making connections, playing games, learning new things. Using these websites play their role in many ways in students personal and academic life. Their way of living, talking, behaving has now been controlled by actions of Social Networking Sites and what they do on that platform. The following paper will discuss about the effect of use of Social Networking Sites by school going students and how their behaviour is getting influenced in positive or negative manner. Results showed that students have positive attitude towards social networking use but they admit that addiction to it cause degradation in ethics & values. The following research also analysed that there exist no significant difference in Social Behaviour gender & subject regarding usage of Social Networking Sites.