Facebook's Most Viewed Article In Early 2021 Raised Doubt About COVID Vaccine
![Facebook is defending itself from accusations from the White House and other critics that it](https://media.npr.org/assets/img/2021/08/21/gettyimages-1232163052_wide-60f5efba4c73063f576e286c9f525f34470da826.jpg?s=600)
The social network acknowledged it had held back a report about the most viewed content on its platform in the first three months of 2021.
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