You shouldn't really post spoilers for anything here unless it's an FF which was released years ago (and hasn't been re-released recently). There are always going to be people who have not yet seen a film or something and it's pretty ignorant to assume that it's okay to spoil things at any time, really. Especially if a thread isn't marked in any obvious way to be about what you're spoiling.
For what it's worth, I know about ten people at work alone who still haven't got around to seeing Avatar yet. I consider them weird, but obviously there are a lot of them. They still intend on seeing it, though.