I'd like to add no call-outs and no cursing (of course, this is just a common-sense rule and I would image that it's a basic "netiquette" rule).
I'm not a prude; nevertheless, I feel that excessive cursing shows one's ignorance because one fails to express himself/herself in a better manner.
Can we leave the "momma" insults out as well?
One more thing: Please learn to use proper English for goodness sake! It's bad enough understanding some of the questions asked by "these people" while having to sort through the sentence fragments, poor spelling, poor grammar, and expletives. [Using a period (".") is a good first step. Proofreading also helps, and editing your comments after-the-fact shows good faith as well.
I understand that not everyone uses English as their native language; in fact, I'm not directing the previous comment to those who use English as a second (or third) language.