Madonna post blocked by Instagram for false virus video
In her post to 15.4 million followers, Madonna claimed that a proven vaccine had been available for months but it was being kept secret "to let the rich get richer and the poor and sick get sicker."
She attached a video of US physician Stella Immanuel who praised hydroxychloroquine as a miracle coronavirus cure.
Various clips of Immanuel's speech have spread rapidly on the internet in recent days, but hydroxychloroquine, an antimalarial drug, has not been proved effective against COVID-19.
Madonna's post was deleted, but screengrabs showed it had earlier been blurred by Instagram and tagged "False Information -- reviewed by independent fact-checkers" with a link to a page debunking the video.
President Trump this week tweeted several clips of the video to his 84 million followers, before the tweets were removed.
His son Donald Trump Jr was temporarily halted from tweeting Tuesday after he also shared parts of the video.
"Nobody needs to get sick. This virus has a cure -- it is called hydroxychloroquine," Immanuel exclaimed in the video, standing on the steps of the Supreme Court in Washington with likeminded physicians.
She also railed against face masks and lockdowns.
Madonna said in May she had recovered from the coronavirus which forced her to pull out of concerts in Paris earlier in the year.
AFP and other media companies, including Reuters and the Associated Press, work with Facebook's fact checking program, under which content rated false is downgraded in news feeds so that fewer people see it.
If someone tries to share such a post, he or she is presented with an article explaining why the information is not accurate.