本研究透過Internet人類學民族誌研究法（Internet ethnography methodology）， 以Affordance 理論與社會資本理論檢視社會網絡系統（social networking system; SNS）的設計特徵、社會行動以及參與者的社會資本發展之間的關係。研究發現， 特定的IT 設計特徵展現了社會空間自主、交流互動、角色扮演、形象展現、關係 發展等社會網絡系統關鍵的社會行動賦能（Social-act Affordances）。在這些社會行 動賦能的促進下，孕育了參與者社會凝聚、社會整合、社會延伸、社會維持等不 同維面社會資本的發展。本研究在理論貢獻上有助於解釋社會絡科技的設計特 徵、社會行動以及與社會資本之間的關係；在實務面，則有助於引用到其他未來 相關社會科技的設計原則上。

In this study we have adopted the Internet ethnography methodology and applied the affordance theory and the social capital theory to investigate the design features, social acts, and social capital in a social networking system（SNS）. The research results show that, specific IT design features facilitate social-space autonomy, communication-interaction, character-playing, impression-presentation, and relationship-administration, which constitute critical social-acts affordances for social networking systems. Differently social-act affordances foster differently social capitals. The findings contribute to the theoretical understanding of the relationship between technical features, social acts, and social capitals by the social networking technologies. In addition, the results uncover design principles for development of social media systems.