It's purpose is not to check facts -- it's to appease the right wing.
That's why they made THE WEEKLY STANDARD, a partisan right-wing magazine and official fact checker
It's going very poorly
They assessed the Weekly Standards and found THEY DID NOT QUALIFY
Facebook accepted them as a fact checker anyway
BUT THE FACT CHECK DOES NOT EVEN CONSIDER IAN'S ARGUMENT. IT TOTALLY IGNORES IT AND FOCUSES ON AN EMAIL THAT WAS NOT AT ALL THE POINT OF IAN'S PIECE
(He has since been appointed a Senator again, replacing the late John McCain)