社群媒體的即時通訊功能成為現今組織中主要的知識分享管道，因此，本研究旨在探討電腦自我效能到知識分享行為的影響歷程，並以社會認知理論與社會資本理論為基礎，試圖了解即時通訊使用強度與社會資本作為中介效果進行詮釋。研究對象為使用社群媒體的在職工作者，並運用問卷調查法在兩個時間點蒐集資料，共計完成212份的有效問卷，並運用階層迴歸的方式進行假設驗證。從研究結果中得到以下結論：(1)電腦自我效能對即時通訊使用強度具有正向影響(2)即時通訊使用強度對社會資本具有正向影響(3)電腦自我效能並會透過即時通訊使用強度的中介效果，進而影響社會資本(4)社會資本對知識分享行為具有正向影響(5)即時通訊使用強度會透過社會資本的中介效果，進而影響知識分享行為。

Social media has become the main knowledge sharing tool. Based on social cognitive theory and social capital theory, this study attempts to explore the influence process of computer self-efficacy to knowledge sharing behavior and understand how instant messaging use intensity and social capital can influence the relationship between them. We distributed the questionnaires to 212 employees at two time points. Hypotheses were analyzed by hierarchical regression. The results showed that (1) Computer self-efficacy is positively related to instant messaging use intensity. (2) Instant messaging use intensity is positively related to social capital. (3) Instant messaging use intensity is mediated relationships between computer self-efficacy and social capital. (4) Social capital is positively related to knowledge sharing behavior. (5) Social capital is mediated relationships between instant messaging use intensity and knowledge sharing behavior.

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