https://www.theguardian.com/technology/2018/oct/16/facebook-political-activism-pages-inauthentic-behavior-censorship
"Facebook has been removing this form of misinformation since 2016." - Better known as censorship to control the narrative in their favour since Trumps election win.
Also fro the article: “I don’t think Facebook wants to fix this,” says Mountain. “I think they just want politics out, <b>unless it’s coming from the mainstream media.</b>”