Let's say that a character named Tom dies at the end of a series called, I don't know, Chair Wars.
You can post: "Just got done watching the last episode of Chair Wars. Can't believe Tom died!" To which people like FK, Keith and I, rightfully, will freak right the **** out about.
OR, you can post: "Just got done watching the last episode of Chair Wars. Can't believe what happened at the end!" Then, those of us that haven't seen it yet have our appetites whetted for the end, and you haven't ruined it for anybody.
People that want spoilers can do a google search to find them. You're not providing for anyone, you're just ruining it for people who don't want it.