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A bug in Facebook's anti-spam filter misclassified posts as spam

Many users complained of Facebook removing their posts under the guise of spam. Facebook later said that this was caused by a buggy anti-spam filter and restored the incorrectly removed posts.

Amidst the COVID-19 outbreak, Facebook was one of the tech giants that pledged to fight misinformation and misreporting yesterday. However, it seems that one of the filters instated had some pretty unexpected results. Specifically, the anti-spam filter mistakenly flagged a non-spam article from the Times of Israel on fighting misinformation as spam.

This was not the only case. Quite a few others complained that their posts had been removed with a notice that "This post goes against our Community Standards on spam". Vice President of Integrity at Facebook, Guy Rosen, tweeted in response that this was caused by a bug in an anti-spam system. He also clarified that it was not related to Facebook's content moderator workforce, which a few people were speculating to be responsible.

Guy later tweeted that the bug was in an automated system that removed links to abusive sites and that it affected posts on all topics, not just those apropos COVID-19. All wrongly removed posts were restored.

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