Social Networking Sites (SNS) have become an integral part of the daily lives of college students, significantly influencing their academic, social, and personal spheres. The present study examines the impact of social media networking sites among college students with special reference to Thoothukudi District. Using a descriptive research design and quantitative survey method, primary data were collected from 380 arts and science college students affiliated with Manonmaniam Sundaranar University through a structured questionnaire. The study analyzes the influence of SNS on various dimensions such as knowledge acquisition, biological and mental health, behavioural patterns, employability skills, time management, and socialization. Statistical tools including percentage analysis, mean analysis, independent sample t-test, ANOVA, and factor analysis were employed to interpret the data. The findings reveal that age does not significantly influence the perceived impact of SNS, while gender and place of living show significant differences in selected dimensions such as health, behaviour, knowledge, and socialization. The study highlights both the positive and negative consequences of SNS usage and emphasizes the need for balanced and responsible use of social media among college students. The results provide valuable insights for educators, policymakers, and students to maximize the benefits of social networking sites while minimizing their adverse effects..