I think we can do what Mary suggested.
And I noticed it to, but was leaving up anything that was free and had to do with learning. I've been taking down promos for events that aren't free and random posts that people make, but I can definitely be more strict.
Also, I don't think we need public guidelines. I think we should make internal ones, but as far as the group goes, I think it may be best for me to just post a "reminder" that people should only post things about free learning or whatever we decide to limit it to.