Facebook has a fact-checking program. That program has third-party fact-checkers. Facebook has been documented as pressuring those third-party fact-checkers to change their rulings.

  https://www.facebook.com/business/help/2593586717571940?id=673052479947730
  https://www.fastcompany.com/90538655/facebook-is-quietly-pressuring-its-independent-fact-checkers-to-change-their-rulings

They can't impute that they checked facts, remove postsings they believe are incorrect, and then quietly put pressure on the fact-checkers to have a different "opinion" as to what is "factual".