What do you consider a valid statute of limitations on spoilers? In most of the TV threads, the instant it airs spoilers are fair game. The day comics release, people want to talk about them and if everybody is spoiler tagging everything this thread will turn into a shit show of black boxes on Wednesday. It already kinda does.
Not excusing people for not using discretion, especially for major stuff like last page WTF-moments. Those should probably stay off limits for a while, but by the time the next issue of said comic is out, usually the big spoiler is going to be common knowledge by everybody who cares.
I dunno, ignore list always seems like a drastic thing to me that should be reserved for people who do blatant assholish shit. I've just made it a habit to avoid the thread until after I've read all the stuff I really care about every week.