With the outbreak of the coronavirus pandemic came a flood of novel misinformation. Ranging from harmless false cures to dangerous rhetoric targeting minorities, coronavirus-related misinformation spread quickly wherever the virus itself did. Fact-checking organizations around the world took up the charge against misinformation, essentially crowdsourcing the task of debunking false narratives. In many places, engagement with coronavirus-related content drove a large percentage of overall user engagement with fact-checking content, and the capacity organizations developed to address coronavirus-related misinformation was later deployed to debunk misinformation on other topics.

Since 2015, there has been a huge increase in laws that ostensibly seek to counter misinformation. Since the pandemic began, this trend has only accelerated. Both authoritarian and democratic governments have introduced more new policies to fight misinformation in 2019 and in 2020. In authoritarian states pandemic-related misinformation provided a new justification for repressive policies. Questions of political motivations aside, as the continuing problem of pandemic misinformation illustrates, it's unclear how effective these laws are.

As progress on vaccine rollout in the United States slowed down in Spring 2021, it became clear that anti-vaccine information posed a public health threat. Using text data from 5,613 distinct COVID misinformation stories and 70 anti-vaccination Facebook groups, we tracked highly salient keywords regarding anti-vaccine discourse across Twitter, thousands of news websites, and the Google and Bing search engines from May through June 2021, a key period when progress on vaccinations very clearly stalled. Granger causality tests showed that searches for anti-vaccination terms on Google as well as the appearance of these terms on Twitter followed spikes in their appearance in less reliable media sites, but not discussion in the mainstream press.

No abstract