During the civil war in Myanmar Facebook played a major role.

Society there made a huge technological jump very fast but the internet was synonymous with Facebook thus people were quite literally unfamiliar with the concepts of mass media or misinformation. The war was very fundamentally fueled by misinformation/propaganda which was promoted by Facebooks algorithm which favored controversial/ragebait posts.

And in all this time Facebook only had a single moderator for the whole country to review posts.