Fake news stories abound on Facebook. Most of the postings are produced by scammers looking to make money on the number of clicks these stories receive. Mark Zuckerberg, the founder and CEO of Facebook, says they are working on a way to weed out these stories. In the meantimes, some creative people have come up with solutions of their own.
The Washington Post ran a story on November 11, 2016 about a group of college students who developed an algorithm that authenticates what is real and what is fake on Facebook. Read about these problem solvers at this link.
A programmer named Daniel Sieradski has developed a Chrome extension called the B.S.Detector. Read about this hoax detector at "Rid Your Feed of Fake News With This Hoax-Detecting Chrome Extension"