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This study formed a framework theorized on supplementary fit and social support to explore users’ perceptions of Subject Well-Being in Social Network Sites. Online surveys were conducted in Facebook and Google+. Empirical results showed that value-based fit and personal-based fit promoted the obtaining of emotional and informational support but not instrumental support, and emotional and informational support had significant impacts on life satisfaction and happiness while instrumental support had no significant impacts on life satisfaction and happiness. Our model pinpointed novel ideas to present how individuals obtain social supports through Social Network Sites and how these social supports influence happiness and life satisfaction.