Here's a few chatbox rules that are simple to follow.
Disrespecting someone/"burning" someone will result in:
1st offense: Warning
2nd offense: Chat kick
3rd offense: 30 minute chat ban
4th offense: Day length chat ban
5th and final offense: Total chat ban
Other than that, just the simple rules. No posting naughty pictures or huge pics. If you want to post a picture, ask a mod or admin for permission to first.
I don't care if urls are posted either, so long as they are good ones and do not lead the users to a porn site or anything. And if you don't spam url's either. Some people have the chat lagging becasue of it...
No harassment, unnecesary pervy comments, no stupid remarks about other rpers either.
Just remember, treat people the way you want to be treated.