Just a few things to keep in mind:
1) 90% of policy, you can learn from reading the Terms of Service threads.
If that's too tough to read, then it really boils down to this: be nice to people (no flaming). And if you don't like the show, don't watch it. (trolling)
2) What's off-topic? Given this is a Cult discussion forum, TV.com specifically created personal pages so folks could have games, personal conversations, fan clubs, chats, etc. Any and all such games, chain-type threads, lounges, fan clubs, etc. can and should go to either personal pages or the TV.Com Fun & Games forum.
Discussion of TV.com and forum policy is off-topic on the Cult discussion forum since they don't concern the Cult TV series, characters, storylines, etc. If you want to discuss policy, you can PM the show editor, and after that the general policy forums.
The occasional straying post is not a concern, but extended personal discussions and thread hijacking are.
If you wish to advertise personal sites, fan clubs, petitions, etc., include them in your signature or your blog, not on the forum in your posts and threads.
3) Spoilers: Make sure to put Spoilers in your topic header if you have spoilers. If you must put a spoiler on a post within someone else's thread, please use spoiler tags. If there is no thread for a future episode, direct discussion to the Season # Spoilers/Speculation Thread.
4) Please don't create "Official"- or "Unofficial"-titled threads. I'd rather avoid either races or competing threads. (Yes, some people like to race to do it: I don't know why.) For episode discussion, see the other pinned thread on the topic.
5 ) When creating new threads, please try to make them discussion rather then polls, so we don't end up with tons of one-liners. thus "Who is your favorite character?" - not so good. "Who is your favorite character, and why?" - better.
6 ) No need to post a "Hi, I'm new" thread. Just jump right in and start posting.
7 ) Reviews go in the review section, for the episode or the show.
Thanks to the 9/20/12 site update, from now on all general and specific episode discussion will go to the episode pages, where the Episode Discussion Stream now exists. Those should be considered the official episode discussion threads, and the same rules apply. All general discussion of an episode should go there. You can also reply to specific posts within the thread, generating sub-messages.
If/when posting spoilers, please be courteous of other users. Only the most recent five posts will appear on the page, and all messages will drop lower on the page after the episode airs. Spoiler-news prior to the episode airing ("OMG - jimmydies.com just officially announced that Jimmy falls down a flight of stairs and dies two minutes into this episode!") should go here under the news thread.
There are apparently some limitations as far as putting separate paragraphs in the same post. But for now, that's what we've got.
If you want to discuss a specific plot point, have a question about something in an episode, or otherwise something that lends itself to broader discussion, you can post here. If you're not sure, odds are that it should go in the review forum or the episode discussion stream. Thanks!