Is there precedent for such a thing? Five or ten years after approving acquisitions and then saying 'oh our bad, that was anticompetitive' I'm not a fan of FB, was only a user briefly (though still maintain whatsapp) but find that this action is a misquided attempt to punish FB because some people can't accept its success and find the platform abhorrent.
[1] https://www.reuters.com/article/us-facebook-instagram-idUSBR...