1. You may not add to an existing thread with your own spoilers. New spoilers MUST HAVE THEIR OWN THREAD. From now on, if you piggyback on other threads your posts will be removed.
2. If you have your own spoiler thread, you should refrain from posting in other spoiler threads. I don't want to do it this way, but there are two reasons why it must be done. First, it tends to set off flame wars between spoilers. Second, no matter what you post, the idiots who inhabit this forum will start talking about what you said, derailing the topic of the thread. From now on, if you post in other spoiler threads, your posts will probably be removed.
3. If a reply contains only "emotional" responses to a spoiler (i.e. "I hope this is right" or "if this is true it will be the worst season ever"), the post will be removed. You may have noticed that this has already been going on for weeks.
4. Try to refrain from discussing spoilers in threads not dedicated to those spoilers. It's all right to compare, but if you find yourself replying to a comparison and your reply consists mainly of points relevant only to the other spoiler, don't post that reply in that thread. If you feel the point needs to be made, head over to the correct thread.
5. Basically, just don't post at all.