This would benefit both FB and an organization like Snopes. When a story or link is shared, if the text checks out by some fact-checking source that is reputable, the story would get some type of icon showing that it is not pure garbage. If it is text, then it would be cryptographically signed somehow, so changing something in the story would make the icon disappear.
Facebook's 'Journalism Project' Seeks To Strengthen Online News
ISC Stormcast For Tuesday, January 24th 2017 https://isc.sans.edu/podcastdetail.html?id=5343, (Tue, Jan 24th)
isc.sans.edu - SANS Internet Storm Center - A global cooperative cyber threat / internet security monitor and alert system. Featuring daily handler diaries with summarizing and analyzing new threats to networks and internet security events.
tech.slashdot.org - The South Korean government plans to unveil a high-speed train that can travel at near-supersonic speeds capable of cutting a five hour journey to just 30 minutes. It's reminiscent of the Hyperloop, a proposed mode of passenger and freight transportation that propels a pod-like vehicle through a ...