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When it comes to fact-checking images, Zuckerberg's company is relying on the same strategy it uses for news stories. If a picture is flagged as false, the company's algorithm buries it on your newsfeed, numbing its influence. If the image completely violates Facebook's community standards -- a post promoting violence, hate speech or terrorism -- moderators delete it.
Comments also help flag posts, said Facebook spokeswoman Lauren Svensson. Posts like "no way this is real!" help signal to moderators that a photo is fake
https://www.cnet.com/news/mark-zuckerberg-facebook-and-fake-news-its-the-memes-stupid/
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