@arwen1 “And secret societies really don’t play a huge role in campus social life. Almost all are seniors-only, and there’s not a huge divide between people in a society and people not in one.”
Penn does not have any “secret societies” but it does have “senior societies” like Friars, Sphinx, Bell etc. From what you are saying they do not sound very different from Yale. They are only for seniors and do not take a huge amount of time.