This study examines the relationship between corporate information on YouTube, a video-based social platform, and financial statement comparability. Using an empirical analysis of 10,238 firm-year observations from companies listed on the KOSPI and KOSDAQ markets in Korea between 2014 and 2022, we find a significantly positive relationship between the number of YouTube videos about a firm and its financial statement comparability. Moreover, this positive relationship is more pronounced for firms with high information asymmetry and for those audited by non-Big4 accounting firms. These findings suggest that YouTube videos serve a governance role over corporate activities, encouraging managers to provide more comparable financial statements. Furthermore, they highlight YouTube's role as an important information-sharing platform that reduces information asymmetry in capital markets. This study contributes to the literature by empirically demonstrating the impact of video-based social media—an increasingly influential information platform—on financial reporting. It also extends the determinants of comparability research to include the media information environment.