How does a mod verify who is and isn't a book-reader? Of course there are some obvious people, but aside from keeping and enforcing a registry you can't really run it that way. That's a lot of work to ask of Cornballer or a mod. I like reading that thread and post in there occasionally but only to directly answer a question that I know for sure is answerable based on the show (e.g. the clarification I made earlier today about white walkers vs. wights). What it needs is enforcement of the current rules. Banning certain parties from either thread isn't much of an answer IMO.
The most damaging sort of potential spoiler stuff is virtually impossible to combat, which is people who have read the books or otherwise know info derived from them who make "predictions" that they attempt to pass off as speculation.
The only thing that can be done about that is for one of the people here to recognize that poster from a previous book thread, and if they haven't posted in one before or have only recently read the books, there's nothing that can really be done about it.
I'm talking about stuff like this, after last week's shadow-birthing ep:
How would it become good versus evil to have Shadow Assassins running amok?
Which came out of basically nowhere. Nobody had mentioned the thing as an assassin before until Wuvcraft just matter-of-factly said it. Did he know something? Was he speculating? Impossible to really tell. That was followed by a couple of others saying it would go after Renly. While it's entirely possible that they were just legitimately speculating, since it is reasonable to make that sort of assumption, the lines there become very blurred and it all gets a bit tricky.
This
This is also damaging