You should by all means protect your privacy. But when choosing to post to the *public* square, that is not a private communication.

And mployers only get away with driving everyone into the closet about dissenting values because everyone permits it. Maybe even the employer himself agrees with you, but because of no one standing up has to pretend not to!

And if the employer really would can you over a dissenting view in your off-work capacity on social media, that is not really someone you should be working with in the long term.