Seriously, this is how the media is spinning this? "Facebook now allows people to post that LGBT people are mentally ill"?
The default behavior of any social media platform is to allow people to say anything they want. That's what social media is for, to allow people to talk to each other. The things it doesn't allow are, and ought to be, exceptions. Facebook has now decided that one of these exceptions will be slightly loosened. I somehow fail to see the big deal in this.