This paper examines how an individual's perception of a friend's social support and self-disclosure influence the individual's intention to continue using a given social networking site (SNS). We also examine how subjective wellbeing and intimate relationship mediate the relationships between the constructs of friend's self-disclosure, friend's social support, and SNS usage continuance. An Internet survey is conducted to collect data from Facebook users. Structural equation modeling is used to test the hypotheses. The results show that a friend's self-disclosure increases the user's continuance intention to disclose, while a friend's social support increases both the user's continuance intention to browse and to support. The intimate relationship factor influences the user's continuance intention to browse and to support, while subjective wellbeing influences the continuance intention to browse and to disclose. The research findings help SNS providers retain users and create value for them.