COVID-19 vaccine reviews on YouTube: What do they say?

After the Covid-19 vaccination started, social media users created an enormous amount of content on the vaccines. Especially in the early stages of vaccination, people searched and watched YouTube videos sharing personal experiences after getting the vaccines (i.e., vaccine review videos), usually titled “I got the COVID-19 vaccine.” Few studies have examined the characteristics and impacts of vaccine review videos on viewers’ responses (e.g., likes, dislikes, comments). This study investigates the content of, and reactions to, the most-viewed Covid-19 vaccine review videos on YouTube, based on the social communication framework. A quantitative content analysis of 148 vaccine review videos revealed their unique characteristics, including source expertise, message valence, narration, and topics. Most of the videos had a positive tone, with some urging vaccination and showing pro-vaccine attitudes. Furthermore, source expertise and hybrid message types (messages conveyed in narrative and informative ways) were not significantly related to positive responses. Rather, non-expert videos received more positive responses. The findings concern the public opinions surrounding new vaccines, including related concerns and attitudes. Given the positive tone of the content, vaccine review content made by diverse groups can be encouraged by public health institutions regardless of the creators’ expertise.