I would be pretty annoyed if I was part of an organization that required me to be keeping up to date on Facebook posts, that used it as the only way to know wha

I would be pretty annoyed if I was part of an organization that required me to be keeping up to date on Facebook posts, that used it as the only way to know what's going on. You should definitely have a mailing list people can sign up to. Facebook is not really an appropriate medium for that kind of thing.