Social networking sites such as Facebook have become extremely popular recently. In this research, we studied how Facebook browsing affects self-awareness and social well-being. Our results show that after Facebook browsing, individuals high in narcissism raised their public self-awareness while those low in narcissism reduced their public self-awareness. We also found that individuals low in narcissism perceived their friends' lives to be better than their own and consequently experienced negative social well-being and emotion. However, this effect did not occur for individuals high in narcissism. Categories and Subject Descriptors J.4 [Social and behavioral sciences]: Psychology General Terms Experimentation Keywords Social networking, self-awareness, narcissism, well-being.