The real story is that Facebook is monitoring DMs. They didn't even post on their Facebook pages, Just "private" DMs. While I don't like what these women did, it is the invasion of privacy that is terrifying.
I'm not on FB. If you are, get off it.
What is ‘DMs’?
And is it so difficult to spell out what you are trying to say.
Literary and contract rules require that the first time usage is spelled out with initials put in parentheses.