在美中競爭加劇以及台美關係良好的現況下，疑美論逐漸在社群媒體中發酵，並在美軍撤出阿富汗、烏俄戰爭、裴洛西訪台事件後，備受臉書使用者的討論。臉書新聞粉絲專頁作為民眾接收資訊的主要來源之一，貼文中對美國相關事件的描述，都可能對使用者的認知及情緒產生影響。為對存在於臉書新聞粉專中的疑美論點進行分析，本文首先以同盟理論安全困境問題對疑美論進行定義，當中包含被美國拋棄以及被美國牽連的論述。其次以框架效應理論的角度，探討美國相關事件對使用者認知及情緒的框架效應作用。本文透過情緒分析、STM主題模型分析與框架效應研究假設的驗證，深入討論阿富汗撤軍、烏俄戰爭、裴洛西訪台事件對使用者的影響，並使用國防安全研究院的民調資料進行對照比較。研究結果顯示，三個案例皆對東森新聞粉專的使用者產生負面影響，僅烏俄戰爭對三立新聞粉專的使用者產生負面影響。而民調資料的結果顯示，約近四成的台灣民眾對美國採取負面的看法。另外在STM主題模型的分析結果中，本文也發現使用者談論疑美論的相關主題，且主題偏於負面。最後在框架效應假設的驗證上，也顯現美國相關貼文與使用者情緒具有負向顯著關係，且也與疑美認知具有正向顯著關係，其中以被美國牽連的認知最為常見。

In the context of intensifying U.S.-China competition and strong U.S.-Taiwan relations, skepticism toward the U.S. has gradually emerged on social media, particularly during the U.S. withdrawal from Afghanistan, the Russia-Ukraine war, and Nancy Pelosi's visit to Taiwan. Facebook news fan pages, as key sources of information for the Taiwanese people, may influence users' cognitions and emotions through their coverage of U.S.-related events. To analyze the presence of skepticism toward the U.S. on Facebook news fan pages, this study first defines skepticism through the lens of Alliance Theory's Security Dilemma, focusing on the concepts of abandonment and entrapment by the United States. Subsequently, from the perspective of Framing Effect Theory, it explores how U.S.-related events impact users' cognitions and emotions. This study utilizes sentiment analysis, STM, and hypotheses related to framing effects to examine the influence of the U.S. withdrawal from Afghanistan, the Russia-Ukraine war, and Pelosi's visit to Taiwan on users. Additionally, the findings are compared with polling data from the Institute for National Defense and Security Research. The results indicate that all three events had a negative impact on users of the EBC news fan page, with only the Russia-Ukraine war affecting users of the SET news fan page negatively. Furthermore, polling data reveals that nearly 40% of Taiwanese people hold a negative view of the United States. The STM analysis further reveals that users' discussions related to skepticism toward the U.S. are negative. Finally, the verification of the framing effect hypothesis demonstrates a statistically significant negative correlation between U.S.-related posts and users' emotions, and a statistically significant positive correlation with skepticism cognition, particularly the cognition of entrapment.

論文審定書i
摘要ii
Abstractiii
目錄iv
圖次v
表次vi
壹、緒論1
貳、文獻回顧3
一、美中台三邊關係之背景與現況3
二、同盟理論下的台灣疑美論點9
三、社群媒體下的框架效應研究15
四、國際關係以及傳播學理論在疑美論中的運用19
參、研究設計23
一、研究案例23
二、研究資料24
三、研究問題與研究假設25
肆、研究結果37
一、臉書新聞粉絲專頁貼文使用者疑美論情緒之變化37
二、民調資料與社群媒體使用者疑美情緒的異同比較41
三、主題模型分析結果46
四、階層迴歸分析假設驗證結果53
伍、結論61
參考文獻67

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