I see — I just think that aside from barring use of their ad platform by publishers of fake news, there's not much Facebook can do that would be effective.

A "verified news" (fact checked or otherwise endorsed) scheme could backfire for the intended demographic. It's not like most FB users are seeking news from verified publications.

It's even kind of a badge of honor: "we're bringing the news THEY don't want you to see!"

And frankly, I don't trust FB to not want to hide something.