Updated April 15, 2021 at 2:39 PM ET
CNN. ABC News. The New York Times. Fox News.
Those are the publishers of four of the five most popular Facebook posts of articles about the Johnson & Johnson COVID-19 vaccine this week. They're ranked 2 to 5 in total interactions, according to data from the tracking tool CrowdTangle.
The No. 1 posting, however, isn't from a news organization. Or a government official. Or a public health expert.