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However, little empirical results were provided in prior literature to elaborate individual\u2019s behavior of micro-blogging use. Consequently, this study aims to explore the possible influence of individuals\u2019 motivations on their self-disclosure and instant information sharing behavior as well as the extent of perceived social support in micro-blogging. Individuals who had experiences on Plurk usage were invited as subjects. The partial least squares (PLS) was utilized to examine the proposed model and hypotheses. Analytical results indicate that popularity and interpersonal needs significantly influence individual\u2019s self-disclosure, while interpersonal and entertainment needs significantly influence individual\u2019s instant information sharing behavior. 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