The mod in our case is in close contact with the school. Sometimes they have her post info on things – I think it is stuff like reminders on dorm closings, or replicas of info sent to students (who don’t always pass on the info to parents). I expect if they asked her to take something incorrect or inappropriate down, she would. I don’t see a problem with it, honestly. In this case the school created the group and makes sure all parents get invited to join. I think they then have the right to moderate as they think is appropriate.