This paper seeks to understand how Facebook affects youth social well-being. It tries to investigate the relationship between intensity of Facebook use and feeling happy, having Life satisfaction, social trust, Self-Esteem, Loneliness, Shyness, through 6 scales. The first section discus well-being meaning and the social factors used in this study. The next section outlines the methodological approach for an empirical test of research questions generated by our review. We then present results. The paper closes with a discussion of the implications of our findings, as well as study limitations and overall conclusions. We found that almost the entire sample had less than 200 contacts, more than half of facebook users spend from 1-5 hours daily. The intensity of Facebook use was positively associated with depression-happiness scale, social trust, Self-Esteem, and Loneliness, and negatively associated with life satisfaction and Shyness. Facebook Members and non members were negatively associated with social trust, Self-Esteem, and Loneliness. The attitude towards Facebook was positively associated with depression-happiness scale, Satisfaction with life, and Self-Esteem.