This study explores how social media may transform political campaigns as well as the interactions between candidates and individuals, centering on communication objectives and interactive patterns. A content analysis is performed on 1,747 posts and the number of likes, comments, and shares on these posts, collected from six main candidates’ Facebook Pages in the 2018 and 2022 Taipei mayoral elections. An analytical framework of “Information-Community-Action” is applied to identify the purpose of social media political messaging and the patterns of interaction it may trigger. Results show that each candidate had their own preferred communication strategies, but none actively communicated about policies with their followers on Facebook. Additionally, live streaming appears to become a critical tool for candidates to build online communities, and it also significantly attracts followers to leave comments. Live streaming can be regarded as a new mode of political dialogue.