Vaccine Hesitancy on YouTube: a Competition between Health and Politics

2025-07-10

AI Summary

YouTube’s vaccine-related content exhibits substantial quality heterogeneity, with anti-vaccine videos frequently embedding political and sociocultural commentary, while platform-level content moderation remains inadequate. Method: We conducted a three-month longitudinal study, collecting daily video metadata and transcripts via systematic web crawling; analyses integrated natural language processing, unsupervised topic modeling, and stance classification to dynamically trace narrative evolution, distinguish creator roles (e.g., health professionals vs. political commentators), and characterize discursive patterns. Contribution/Results: We find that 20.8% of sampled videos express vaccine hesitancy, yet only 2.7% were removed—indicating regulatory inertia. Anti-vaccine content disproportionately references politicians and alternative media, whereas pro-vaccine content emphasizes disease epidemiology and immunological mechanisms. Crucially, public health communication and political discourse compete structurally for audience attention. This study empirically identifies algorithmic governance failures in digital health information ecosystems, offering evidence-based insights to refine content moderation policies and digital health communication frameworks.

Technology Category

• Application Domains: Misinformation & Fake News
• Natural Language Processing: Fact-Checking / Misinformation Detection (NLP Focus)
• Computer Vision: Video Understanding & Activity Analysis

Application Category

• Web Mining and Content Analysis: Web data quality in the era of algorithmically-generated content
• Responsible Web: Algorithmic accountability and transparency on the web
• Social Networks and Social Media: Media and governance, opinion dynamics, filter bubbles, polarization

Abstract

YouTube has rapidly emerged as a predominant platform for content consumption, effectively displacing conventional media such as television and news outlets. A part of the enormous video stream uploaded to this platform includes health-related content, both from official public health organizations, and from any individual or group that can make an account. The quality of information available on YouTube is a critical point of public health safety, especially when concerning major interventions, such as vaccination. This study differentiates itself from previous efforts of auditing YouTube videos on this topic by conducting a systematic daily collection of posted videos mentioning vaccination for the duration of 3 months. We show that the competition for the public's attention is between public health messaging by institutions and individual educators on one side, and commentators on society and politics on the other, the latest contributing the most to the videos expressing stances against vaccination. Videos opposing vaccination are more likely to mention politicians and publication media such as podcasts, reports, and news analysis, on the other hand, videos in favor are more likely to mention specific diseases or health-related topics. Finally, we find that, at the time of analysis, only 2.7% of the videos have been taken down (by the platform or the channel), despite 20.8% of the collected videos having a vaccination hesitant stance, pointing to a lack of moderation activity for hesitant content. The availability of high-quality information is essential to improve awareness and compliance with public health interventions. Our findings help characterize the public discourse around vaccination on one of the largest media platforms, disentangling the role of the different creators and their stances, and as such, they provide important insights for public health communication policy.

Problem

• Analyzes vaccine hesitancy content competition on YouTube
• Examines lack of moderation for anti-vaccination videos
• Identifies key themes in pro- and anti-vaccine videos

Innovation

• Systematic daily video collection for 3 months
• Analyzed competition between health and political content
• Identified lack of moderation for hesitant videos