隨著web 2.0技術的廣泛應用，社群媒體的崛起已成為一股趨勢，為了更貼近選民的日常生活，各政黨紛紛投入大量資金到社群媒體上，這些挹注的資源影響著選民的政治生活與各式重大社會議題，著名的案例有2016年的英國脫歐公投、2016年美國總統選舉，都可觀察到社群媒體顯著的影響力。這些社群媒體所造成的現象吸引學界進行相關研究，然國內相關研究仍多半以單一社會議題作為研究場域，尚未加入政黨政治為背景，來探索社群媒體中同溫層效應如何對於公眾造成的影響。
　　有鑑於此，本研究將以同溫層效應為理論基礎，並以探討社群感知好友立場一致性及感知社群新聞立場一致性作為衡量指標，來觀察其對線上政治表達及線下投票所造成的影響，並使用民主滿意度作為中介變數，政黨忠誠做為干擾變數，進行相關的研究探討。
　　研究結果有以下發現：第一，發現同溫層效應，不僅會提升個人的民主滿意度，也會加強個人於線上政治表達與投票的意願。第二，民主滿意度僅會對線下投票行為產生中介效果，在線上政治表達不具中介角色。第三，政黨忠誠具有負向調節作用。具體而言，有政黨偏好的個人，相比起中間選民，反倒會有較低的民主滿意度、線上政治表達與投票意願。

　　With the wide application of web 2.0 technology, the rise of social media has become a trend. In order to be closer to the daily life of the voters, political parties have invested a lot of money in social media, and these resources have influenced the political life of the voters and various major social issues. The influence of social media can be seen in famous cases such as the 2016 UK Brexit referendum and the 2016 US presidential election. These phenomena caused by social media have attracted research in the academic field, but most of the related studies in Taiwan still focus on a single social issue, and have not yet included party politics as a background to explore the impact of the stratospheric effect of social media on the public.
　　In view of this, this study takes the echo chamber as the theoretical basis and uses the community's perception of the consistency of friends' positions and the consistency of the community's perceived journalistic positions as the indicators to observe its impact on online political expression and offline voting, and uses democratic satisfaction as the mediating variable and party loyalty as the interfering variable in this study.
The results of the study include the following findings: First, the echo chamber effect is found to increase not only individuals' democratic satisfaction, but also their willingness to express themselves and vote online. Second, democratic satisfaction only mediates offline voting behavior, but does not mediate online political expression. Third, party loyalty has a negative moderating effect. Specifically, individuals with party preference are less likely to be satisfied with democracy and less likely to be willing to express themselves and vote online compared to the middle class of voters.

論文審定書 i
摘要 ii
Abstract iii
目錄 iv
表次 v
圖次 vii
第一章 緒論 1
第一節 研究背景與動機 1
第二節 研究問題與目的 4
第二章 文獻回顧 6
第一節 社群媒體與同溫層效應 6
第二節 同溫層效應與政治行為 11
第三節 社群媒體與民主滿意度 16
第四節 政黨忠誠的調節作用 19
第三章 研究方法 23
第一節 研究架構 23
第二節 資料收集 24
第三節 問卷變項定義及測量題項說明 25
第四章 資料分析與結果 31
第一節 受試者描述統計分析 31
第二節 假說驗證 37
第五章 結論與建議 58
第一節 研究結論 58
第二節 理論貢獻 61
第三節 研究限制與未來展望 62
參考文獻 64
附錄一 研究問卷 73
附錄二 各變項次數分配表 76

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