I applaud Facebook's efforts to counteract "fake news" but I'm not at all certain that an algorithm can be created to accomplish that. However, using several sources for "fact checking" is a good idea.

However, you can do that yourself. When a posting says something like "Police gun down Boston dissidents" or "President suspends habeas corpus" you might just check on things like the dates. The first might be March 5, 1770 and the second to Lincoln's General Orders No. 141, September 25, 1862 which suspended habeas corpus during the Civil War.

Then read the article. Very, very often you'll find that includes "weasel words." "Trump's FEMA may arrest liberals and execute them" does not mean that it is happening; it says it COULD happen. Likwise, "Obama wants to shut down space program!" does not mean it will happen -- for one thing, Congress has a say in such things.

In fact, let's stop labeling governmental agencies. It's not "Truman's War Department" or "Bush Supreme Court" anymore than it's "the Queen's Parliament" or "Merkel's Bundestag."