Why should the PM be treated differently than anyone else? Just because she's the PM? FB has any right to remove whatever they want from their private property.
I'm starting to get tired of making this point in some of the many discussions of this topic (most recently https://news.ycombinator.com/item?id=12457371 ), so the last time for a month, I swear: You tell me when I can open a segregated lunch counter, or refuse to bake a gay wedding cake, and I'll consider your argument to have merit. Otherwise, it's only a matter of time until Facebook and company are brought to hee…
If I'm a baker, why can't I refuse to make certain cakes? I mean, I would never turn away a customer, but if the customer asked me to write obscene things on the cake, don't I have the right to refuse their request?
"I'd like to have a rainbow cake" "ok" "with little penises sticking out of it for my gay wedding" "no, sorry."
What's wrong with that? It's no different from refusing a straight man's request to have a cake with the outline of a nude woman on it.