隨著網際網路的發展，人們花費更多時間群聚在網路空間裡活動，實體社群 的概念也因此延伸至虛擬網路中。在網路空間瀏覽時，可以看到相當多主題和性 質不盡相同的線上虛擬社群，例如：提供人們交誼聯繫的社群、或是以論壇討論 形式存在，讓人們對共同的興趣討論和分享資訊的帄台。其中，資訊瀏覽和分享 的交流以及人際往來討論的互動，是網友參與虛擬社群的核心活動，故不論對哪 種虛擬社群來說，擁有一個良好的資訊交流和互動環境是相當重要的，也成員社 群經營者關心的問題。 本研究以探究社會群體活動特性的社會資本為基礎，將過去學者所定義的社會資本三構面：認知面（cognitive dimension）、結構面（structural dimension）、關係面（relational dimension），應用至虛擬社群成員交流互動的參與行為探討，並選擇在台灣具有代表性的虛擬社群–Facebook 和Mobile01 作為研究對象，Facebook 是讓參與成員和朋友維持社交友誼的社群，Mobile01 則是讓對相同主題有興趣的成員一起交流討論的社群，兩個虛擬社群主要內容和群聚成員參與的動機和目的都不盡相同，各代表了不同性質種類的虛擬社群。研究結果發現不同構面的社會資本對於成員在社群內交流互動的參與行為有不同程度的影響，而不同性質的虛擬社群在同一構面的社會資本下對於參與成員的行為債向也會有不同程度的影響。 / With the rapid development of internet, much more people have spent much more time surfing through internet. The concept of community in the real life also extends to the virtual network. There are so many kinds of virtual community in the virtual network space that it provide different content and benefit for members, including social contacts and common topic discussion. Actually, the information sharing and interpersonal social interactions are the core activities for members in the virtual communities. Therefore, it is important to form a good environment in the virtual communities. This research uses social capital, constituting cognitive dimension, structural dimension and relational dimension, to examine the behavior of members in virtual communities. We choose two different types of virtual community, Facebook and Mobile01, as our sampling source. Facebook provides members to stay in touch with their friends, and Mobile01 provides members to discuss common topic of conversation and interest. Therefore, members in these virtual community have different purpose and motivation. The results found that different social capital can influence members’ behavior in different ways. Also, different types of virtual communities can influence members’ behavior in different ways through the same social capital dimension.