I use Facebook. It's a love-hate relationship. However, it's become ingrained in my daily habits; like reading the morning newspaper. I don't believe everything I read on Facebook, but it's entertaining while I'm trying to wake up in the morning.
The only news I really feel is legit on Facebook is news from local media sites or the national media sites we're all familiar with: FOX News, CNN, etc.. Whenever I see an article from a politically biased web address or one I don't recognize, I usually chalk it up as fake news until I see the same report on a familiar news site.