Adolescents are today’s most profuse users of Social Networking Sites. Many of their experiences and opportunities will be shaped by their engagement with SNSs. Thus, the study entitled “Purpose of using social networking sites by adolescents” aimed at studying the various purpose of using SNSs by adolescents across gender. Total 120 students equally distributed over gender who were randomly selected from 2 schools of Lucknow city, Uttar Pradesh. A self-structured questionnaire was used in this study. The study reveals that majority of the adolescents uses SNSs for sharing messages and chatting with friends were in the age of 15-17 years. Social acceptance topped the reasons for sharing personal information on SNSs by both boys and girls. Results also revealed that majority of the boys uses less than 1 hour a day, while girls uses for maximum duration i.e. 3-6 hours daily. However, there exist no significant differences on the purpose of using Social Networking Sites across gender and age.