Rating
Anyone can enter the channel. Out of respect for social regulations, the channel can be considered PG-13 - first and foremost this means that sexuality of any sort is expressly disallowed. Generally, keep in mind that people of any age may stumble into the chat room at any moment.
Spamming
Any attempts to fill the screen purely with gibberish, rick-rolls, or links to inappropriate content will get you an instant treat of a boot to the arse. (This means you're welcome to post your petting link; however, if you merely log into the channel, post your link and leave again, you can be fairly certain no one will actually click on it, so try to avoid flyby link posting for everyone's benefit.)
Swearing
Swearing is all right in the IRC channel, as long as it does not break another rule in the process. Additionally, insulting people is disallowed.
Impersonation
Forbidden. If you break this rule, you will be permanently banned without any sort of warning once we figure things out.
(Regulars are advised to register their nickname, effectively preventing mix-ups.)
Note also that the simple use of another person's nickname does not constitute impersonation.
Other
There are no other rules to the chatroom, though out of courtesy, please do not type in all-caps - it is considered shouting.