>>Tanger+(OP)
I didn't expect to agree with Facebook corporate but here I am. It's one thing to privately disagree with a coworker about their action or lack thereof with respect to a contemporary event. But to drag it into a public setting is a severe violation of boundaries and borderline harassment. It's a huge liability risk to FB -- to scold your colleagues in public for their desire to separate the political from the professional is workplace harassment and something that would probably get you fired anywhere.
With that said, I get the sense there is a large part of a story that is not being told here. Where was the manager? Has this employee had a history of maintaining appropriate professional boundaries with respect to communication? If Facebook doesn't have the appropriate paper trail, they could easily be sued for retaliation.