The reason for the mass unpublishing of pages could be the ongoing glitch in fb system. Private messages are ending up in page post comments and also in page message boxes. These are messages sent by people to their friends and end up on pages. Vice versa posts by pages and comments made on posts end up in people's private messages and get reported as spam messages. I had people message my pages threatening to report my page if I don't stop sending them messages. That's how I figured out what was going on. Pages are flooding private messages with spam due to facebook glitch. We need to mass report that problem to facebook to stop this madness of mass unpublishing pages for spam.