Before revision:  Finally, a known conspiracy theory was more likely to be ``laundered'' through social media platforms than low-credibility news sources . In contrast, misinformation reflecting legitimate scientific uncertainty was primarily discussed by credible news sources . These results suggest that the social media discourse reflects an attempt to come to grips with deep scientific uncertaintyduring an emerging pandemic, with significant content emanating from unrated; not low credibility, sources. When low-quality content is generated by these unrated sources, they may be amplified by high-credibility sources inadvertently lending them credibility .
After revision:  Finally, a known conspiracy theory was more likely to be disseminated through credible sources when compared to other health topics. Furthermore, the assumption that credibility is an adequate proxy for false content may overestimate the prevalence of false content online: less than 25\% of posts linking to the least credible sources contained false content. Our results emphasize the importance of distinguishing between explicit falsehoods and more ambiguous forms of misinformation due to the search for meaning in an environment of scientific uncertainty .