For anyone who might have skimmed over the link that zntke711 posted, I highly recommend going back and reading it. It is very well done.
I think a lot of us don't really understand WHY we keep things secret, and this leads to problems at two extremes: We either go way overboard on the secrecy (what I call 'secrecy purely for the sake of secrecy'), or we don't take our vows seriously enough and casually pass information to outsiders. Both scenarios are equally damaging.
Perhaps "secret" is the wrong word for us to use, since most people attach a dark meaning to that word. Things shared between members of a GLO (and for that matter, members of any family) are better and more simply described as "private".
wptw