There's two possibilities here.
Either these reps are extolling the virtues of their universities out of the goodness of their hearts (possible, but unlikely) or they're receiving some sort of compensation/remuneration for doing so. If the latter, they need to comply with consumer protection legislation etc and make it clear that their posts are, essentially, paid marketing for their institutions.
I think this is pretty important. There are a lot of impressionable individuals who use this site who can be (understandably) influenced by the views of those who purport to officially represent universities and provide guidance. At the very least, each post from these reps should be labelled to make it clear that their views are paid marketing. That would, at least, flag to users of this site that posts from these reps aren't quite as independent as they thought.