Characterizing User Susceptibility to COVID-19 Misinformation on Twitter

Abstract

Though significant efforts such as removing false claims and promoting reliable sources have been increased to combat COVID-19 ``misinfodemic'', it remains a societal challenge if lacking a good understanding of susceptible online users, i.e., those who are likely to be attracted by, believe and spread misinformation. This study attempts to tackle this problem by understanding {\it who} constitutes the population vulnerable to the online misinformation in the pandemic, and what are the robust features and short-term behavior signals that distinguish susceptible users from others. Using a 6-month longitudinal user panel on Twitter collected from a geopolitically diverse context in US, we distinguish different types of users, ranging from social bots to humans with various level of engagement with COVID-related misinformation. We then identify users' online features and situational predictors that correlate with their susceptibility to COVID-19 misinformation. This work brings unique contributions: First, contrary to the prior studies on bot influence, our analysis shows that social bots' contribution to misinformation sharing was surprisingly low, and human-like users' misinformation behaviors exhibit heterogeneity. While the sharing of misinformation was highly concentrated, the risk of occasionally sharing misinformation for average users remained alarmingly high. Second, our findings highlight the political sensitivity, activeness and responsiveness to emotionally-charged content among susceptible users. Third, using an interpretable deep learning model, \addr{we demonstrate a feasible solution to efficiently predict users' transient susceptibility solely based on their short-term news consumption and exposure from their networks.} Our methodology and results have an implication in designing effective intervention mechanism to mitigate the misinformation dissipation.