Unlike the Fight Club, there are no strict, clear-cut "rules" to participating in the Cardcaptors Uncensored Message Boards. However, like 18th century marital law, there are several cutely-named "rules of thumb," which you can follow if you want. Or not, it's really up to you, although you probably should.

1. Swearing is fine, but don't overdo it. Also, please keep subject-lines clean. There are no automatic filters installed to edit out profanity, so if you want to say something that'd be really shocking and controversial to the 4th-grader portion of our demographic, no one is stopping you from posting a two-page meditation on the f-word. However, please keep in mind rule of thumb #1: before posting anything, consider: would you kiss your mother with those filthy fingers?
2. Post topics into the relevant forums. Rule of thumb #2: if you don't know where to post something, chances are it belongs in the Social Chat forum.
3. Strictly as a rule of thumb, I don't delete posts unless I have a very good reason. Short of posting pornography or otherwise obscene material, anything goes as long as you preface it with a warning. The same goes for spoilers. Rule of thumb #3, Example #1: before you tell everyone the big secret of The Matrix Revolutions - that humans are actually a race of futuristic robots - make sure you post "SPOILERS!!!" followed by a few line breaks first. Example #2: before posting what I'm sure you thought was a very tasteful, artistic picture of a naked Mexican man, just don't.
4. Political/religious/whatever debates are fine, but keep them in the Social Chat forum. Keep in mind that we've been through more "omg xtianity is so stoopid!!" threads over the years than most people should have to bear, and most of us have become incredibly jaded as a result. There is no Rule of thumb #4, but there is a Law: Before bashing an entire belief system based on the actions of a few stupid people, please check out ReligiousTolerance.org. Also keep in mind: The Church of Scientology^©®™ is not included in the above statements and you are strongly encouraged to call L. Ron Hubbard^® an asshat.
5. If you're a newbie, post a short introduction in the ungrammatically-named Newbies Welcome forum. Rule of thumb #5: it also might help to lurk (read without posting) for a few days in the other forums before posting there.
6. Two-line signatures are standard. Any more than four is considered rude. Rule of thumb #6: if your well-being depends on posting the entire lyrics to Drops of Jupiter in your sig, combine them to fit on two or three lines.
7. A long-winded note on avatars: avatars are little icons you can choose to have appear under your name in your posts. By default, you have access to over 230 avatar images from a variety of anime and video games. Rule of thumb #7.a: Before choosing one for yourself, lurk around the forums and check to see if someone is already using the avatar you've chosen. Many people are recognized by their avatars, and it's considered rude for a newbie to use one that another member's had for months before.

   Once you reach 30 posts, you will be allowed to specify a custom avatar from a location on the web. Note that these images should be 60 pixels in width, and similar in height. They will be sized by your browser to fit the width and a proportional height, but they will still be stored at the address you've chosen. Rule of thumb #7.b: therefore, it's extremely important (and I can't stress this enough) to host your avatars on your own server, and not directly "hot-link" images from someone else's. If you need free hosting, you can get an account at Tripod.

8. Rule of thumb #8: enjoy our unique take on the concepts of insanity and obsessive-compulsion. If nothing else, you can leave this website with the comforting knowledge that at least you didn't just spend thirty dollars for a 60 minute-long DVD and brag about it on a public forum of 800 people. Unless you did, in which case I'm sure you'll fit right in.