The Rohingya genocide? While I agree that Facebook does not do enough to moderate content in non English communities, what percentage of the blame do you think Facebook actually deserves here? Recall this genocide was funded and executed by the military of a sovereign state.
It's _forcing_ increased polarization in politics? Be fair. We all have a choice whether or not to engage with content on Facebook, and whether we accept what we see there as truth. Facebook is available in every democracy in the world. In my home country of Canada, we just had a safe and fair election between a reasonable number of moderate parties. We had no insurrection. Many countries are able to do the same. There are a few exceptions.
You're using the term "facilitated" constantly in this post because really all Facebook has done in these cases was serve as a communication medium for blameworthy people with bad ideas. You seem to have no interested in the people who actually _did the things_.
Do you think anything you pointed out here would be difficult to do given any other existing communication medium?