I often think that sometimes (and only sometimes) fandoms place too much emphasis on the person in the know and telling them what to post or not post. Sometimes it's up to the spoiler-allergic person to take responsibility for avoiding them.

I'm one of those folks who not only doesn't mind spoilers, but in some circumstances will go looking for them. And yet there are times when I'd rather not know. In that case, I take steps to minimize my exposure to likely spoilery material. The onus is on ME to avoid looking where spoilers are likely to lurk.

BUT unless it's someone who very clearly has deliberately set out to spoil people (rather than someone posting in an excess of enthusiasm) I'm not going to get all mad at her/him.

Because, let's face it, that is the nature of modern communications and technology--spoilers are everywhere. If I get spoiled when I'd rather not be, then I may be annoyed or disappointed, but the anger some people show over it is all out of proportion to its importance.

Also, there is the fact of what some people consider "spoiler" material. To me that would consist of revealing a key plot point, or the resolution of a mystery. To others it even extends to pictures of an episode or the revelation of who is playing what role. I've heard some people who don't even want to see trailers for movies or shows.

Those who are that sensitive to spoilers are going to have to spend their life with their eyes shut, fingers in their ears, singing "la-la-la".