Just that, really. A friend has taken umbrage because somebody posted a GOT spoiler on his facebook page. But having read the books years ago, I was a little surprised that anybody didn't realize that particular event was coming.
I can understand if you're watching a series that's new to everybody, that you wouldn't want to spoil it for people who haven't had a chance to watch it yet. And likewise, when the HP books came out, people were careful not to tell what happened for people who hadn't read that far yet.
So, is it still a spoiler if the information has already been out there for years, albeit in a different format?