A descriptive cross sectional survey approach was undertaken to assess the knowledge on impact of using facebook among adolescents in Kongu Polytechnic College, Salem". 50 adolescents were selected by simple random sampling technique and data were collected by using structured interview schedule. The demographic characteristic of adolescences reveals that highest percentage of the adolescents belonged to the age group of below 18 years and 18-20 years (34%), male (74%) and Hindu (76%) whereas

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... % of the adolescents were residing in rural area and nuclear family 58%. However 38% of the adolescents had monthly family income below Rs-3000 and 40% of adolescents had knowledge from friends and family members. Overall mean was 10.08 ± 69.35 which was 53 % of the maximum score shows that an adolescent has average knowledge regarding impact of using facebook.