本文融合「新聞動機使用」與「不經意接觸政治」觀點，利用2017 年傳播調查資料庫資料探索社群媒體上新聞與政治資訊使用類型，並討論其前因與後果。研究發現四種新聞與政治資訊使用型態，近半數使用者是在不經意的狀態下接觸政治資訊，社群媒體上的自我表達可能是重要機制；此外，這樣的使用經驗有助政治討論，但對擴大網路新聞管道使用的助益有限。另外半數使用者可再區分為三種類型，這些使用者在個人背景、網路新聞使用數量、以及政治討論上，皆有所不同。

Using the 2017 Taiwan Communication Survey data, this study integrates the perspectives of “motivational news use” and “incidental exposure to politics” to explore the types of news and political information use on social media and the predictors and consequences of different uses. We identify four types of users. Nearly half of users who frequently express themselves are more likely to incidentally encounter political information on social media. Furthermore, the results indicate that incidental exposure to politics facilitates political talk but has limited effects on exposure to the number of online news outlets. The other half of the users are classified into three other types. They differ on personal background, exposure to online news outlets, and political talk.