Can you elaborate a bit on what you are trying to do here?
Are you trying to have a CMS item whenever a new facebook post is created on a certain page? Do you need it to be like a whole post meaning it has options to like, comment etc… or would you just create a custom card which would show the content of the post.
Let us know and we might be able to help but either of those options will include some 3rd party app. As far as I’m aware there’s no native options to do anything simillar to that.