This study explores the role of social media in public health through a case of carbon monoxide (CO) poisoning prevented and subsequently overlooked, as influenced by digital community interaction. A TikTok influencer shared an experience with a coal stove, leading to followers advising against its use due to CO poisoning risks. This advice was heeded, yet a family member, unaware of these risks, experienced CO poisoning. This incident illuminates social media’s potential in disseminating life-saving health information and influencing behavior, forming the basis of “Media Epidemiology.” This new field studies how digital communication impacts health-related behaviors and outcomes. Our analysis highlights social media as a tool for rapid health information dissemination and preventive action. It underscores the need for integrating digital platform dynamics into public health strategies, emphasizing education on hazards like CO poisoning. This study advocates for leveraging social media in public health, exemplifying its role in disease prevention and health promotion, and marking a significant stride in contemporary epidemiological research.