This is now what happens when you try to post fake news on Facebook - Quartz

Another pop-up reasserts that this content is “disputed,” and I have to click “Post Anyway” in order to share the link on my timeline. Facebook’s latest venture appears to be a hybrid human-computer solution, relying on professional fact-checkers for verification and its algorithms. ” Search for “Facebook warning” on Twitter and you’ll find many people either asserting that the Irish slave trade was real or criticizing Snopes. It’s currently unclear how often these disputed articles are being flagged on Facebook to spark the fact-checking pop ups. From here, Facebook links me to pages on Snopes and AP that fact check the Irish slavery story.