I cant deny that some of the people I associate with are not the sort that you describe, but then look at the places I go exploring with them, run down mills, done to death industrial sites that are about to fall down. Not high key places that will get locked up in an instant, and last night I had a run in over this exact issue about people not posting np stuff and myself and another person I would say is a well trusted member from here were shocked at the rubbish some of them were coming out with.
Just like you I would also like to know who has been sharing the info with people as they will soon be off my friends list, the trouble is we will never know as they will never own up to it. But I can def say I did not share that info, and I am trying to find out who it is, as it would seem they are doing it a awful lot, and I don't want my name tarnished with that brush in the slightest. When I went I was was shown it by 2 other people who are not on the forums at all and it was there 2nd or third visit I think.
But again I wish there was someway I could prove this other than the messages I have from people asking me for access a month before I went and I just tell them sorry but I don't know of any for it, then 3 days later they are in there posting me images of it.