US will label as propaganda any article coming from RT - for Russia, or that Iranian journal - for Iran, and now FB starts simply censoring those contents.
At the same time in Russia or Iran, news coming from US are labelled as propaganda as well.
Depending on where you live, you get fed either one of these "propaganda" and you feel you are on the "good" side and that others are on the "bad" side.
My point is the world is not divided between "good" and "bad", everything is not black or white, and the fact that a website with billions of users has the power to decide what is good or bad (or has the obligation to follow directives from a government) is a very bad idea imho.