本研究以個人需求理論出發希望了解在社群網站形成的人際關係網絡中，對朋友的自我揭露如何受到個人自我呈現需求和人際關係需求影響；以及進一步，是否會因人格特質而有差異。我們對使用Facebook者，以問卷調查法進行，有效問卷513份，以PLS進行資料分析。結果顯示，個人自我呈現、主動包容和情感期待需求對普通朋友及親密朋友的自我揭露有正向影響，情感表達需求對普通朋友的自我揭露有正向影響；被動歸屬需求對普通朋友及親密朋友的自我揭露有負向影響。最後，高低外向與自戀人格特質亦會對使用者自我揭露產生不同的影響。 Purpose－This study tried to understand the influence of self-presentation need, interpersonal need on self-disclosure of ordinary friends and intimate friends at the social network sites. Design/methodology/approach－Sample survey was applied to investigate Facebook users. The PLS was applied to data. Findings－The results reveal that ＂self-presentation＂, ＂expressed inclusion＂, and ＂wanted affection＂ needs have positive impacts on self-disclosure to both ordinary friends and intimate friends. ＂Expressed affection＂ needs have positive impacts on self-disclosure to ordinary friends. In addition, ＂wanted inclusion＂ has negative influence on either ordinary friends or intimate friends. Furthermore, there are some different findings among high/low extroverted groups and high/low narcissistic groups. Research limitations/implications － This is a cross-section survey, not longitudinal. Besides, we did not explore the detailed dimensions of self-disclosure. Practical implications－Website operators can refer to our findings to design more attractive functions. Originality/value－This study is based on grounded theory to investigate why people would self-disclose at the social network sites.