Introduction Facebook is included in most popular websites with over 600 million users in the world. 1 Facebook users enjoy many benefits. In recent experiments, it is found that distressed people feel better when they turn to Facebook. 2 According to different opinions, Facebook addiction means spending an excessive amount of time on Facebook. Normally, excessive Facebook use interferes with important activities of a person's life. 2 Facebook has a great influence on our daily lives; we can observe that people from every age group are using Facebook. The meaning of narcissism involves seeking attention or wanting to be liked. People who use social media sites want to make relations with other social media users. Previous studies found correlation between Facebook addiction and narcissism. 3 In an individualistic society, Facebook is a social and cultural norm. 4 People with extrovert personality have a more intense tendency to be Facebook addicts. 5 Results of a study showed that extroverts want unlimited contact with friends and the virtual world for higher stimulation and large social network. It also revealed that people with low scores on conscientiousness spent more time on Facebook. People having openness trait showed no influence of using social networking sites. People with agreeableness and neuroticism also have no impact of Facebook. 5 A recent study on university students exploring narcissism on Facebook and self-promotional and anti- social behaviours among Facebook addicts found consistent results for its hypothesis. 6 A study defined self-esteem as the subjective evaluation that a person makes and maintains about himself or herself and the extent of belief in their capability, worth and significance. 5 It found no relationship between self- esteem and social networking sites (SNS) use. The excessive use of modern technologies is specifically limited to young people and, as a result, addictive tendencies are more common among them. 7 Some studies observed that Facebook usage had a significant negative relationship with self-esteem (University of Gothenburg in Sweden, 2012). 8 One study found that people with low self-esteem feel safer when they use Facebook. It was also concluded that people with high self-esteem usually post positive updates and get positive responses. 9 It is also observed that young people have more chances of falling victim to SNS addiction. 10 Social media has become an important part of our life, J Pak Med Assoc 260 ORIGINAL ARTICLE Impact of facebook addiction on narcissistic behavior and self-esteem among students Sadia Malik, Maheen Khan Abstract Objective: To investigate the relationship between Facebook addiction, narcissism and self-esteem and to see if gender played any role in this equation. Methods: The correlational study was conducted from February to March 2013 at the Department of Psychology, University of Sargodha, Punjab, Pakistan. Using convenient sampling, two equal groups of male and female students were enrolled from different departments of the university. Bergen Facebook Addiction Scale, Hypersensitive Narcissism Scale and Rosenberg's Self-esteem Scale were used for evaluation. SPSS 17 was used for statistical analysis. Results: Of the 200 subjects in the study, 100(50%) each were males and females. Facebook addiction was positively correlated with narcissism(r=0.20; p<0.05) and negatively with self-esteem(r=-0.18; p<0.05). Relationship between narcissism and self-esteem was non-significant(r=0.05; p>0.05). Facebook addiction was a significant predictor of narcissistic behaviour (β=0.202; p<0.001) and low self-esteem (β=-0.18; p<0.001). There were no significant gender differences in the three variables (p>0.05 each). Conclusion: Facebook addiction was a significant predictor of narcissistic behaviour and low levels of self-esteem among students. Keywords: Facebook addiction, Narcissism, Self esteem. (JPMA 65: 260; 2015) Department of Psychology, University of Sargodha. Correspondence: Sadia Malik. Email: drsadiamalik13@gmail.com