The Wall Street Journal has a “Red View / Blue View” stream of Facebook articles they have posted for us to look at. The actual page is here and the article showing the methodology is below the feed as well as here (not sure if everyone can get around the pay wall)
It is quite educational following some of the Red side’s rants, about 25% of the “headlines” are either outright lies, made up stuff or rants that purport to have opinions shown as fact. While the feed changes with time, one Red view article even said, “You won’t see this on Facebook” even as Facebook was displaying it.
It really is too bad that each “side’s” view is reinforced with such feeds though. Everyone needs to have exposure to what the opposing viewpoints are present in the public discourse—even if some seem absolutely crazy.