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Infodemic

An infodemic is an overabundance of information—both accurate and inaccurate—that makes it difficult for people to find reliable sources and trustworthy guidance during a crisis or health emergency. The term combines "information" and "epidemic" and is increasingly used to describe the rapid, contagious spread of information during public health crises, particularly the COVID-19 pandemic.

Key characteristics:

  1. Information excess — The sheer volume of claims, rumors, and commentary overwhelms the information environment, making signal-to-noise separation difficult.

  2. Mixed credibility — Both reliable and unreliable information spread simultaneously, often through the same channels and with similar speed, making source discrimination critical.

  3. Platform asymmetries — Different social media platforms exhibit different amplification patterns for reliable versus unreliable content due to algorithmic ranking, user behavior, and network structure.

  4. Behavioral consequences — Exposure to infodemic conditions correlates with reduced trust in institutions, increased belief in conspiracy theories, and suboptimal health and policy decisions.

  5. Temporal dynamics — Topic prevalence, source credibility distributions, and spreading patterns change as crises evolve.

Epidemic models and R₀ — Researchers apply epidemiological concepts to information spreading, estimating basic reproduction numbers (R₀) to characterize how infectious information is on a platform. When R₀ > 1, information exhibits epidemic behavior; when R₀ < 1, information naturally dies out.

Key papers