Just as long as it's not on forums and not in the form of megaloads of spam or anything like that. -.-
One thing that I really hate is noobs who think that if they're new, then they're excused any bad behaviour. Or noobs who refuse to read rules and claim that they couldn't find them. Advertising also irritates me; it's not allowed here and even if you didn't read the stickies, the fact that your advertising topic has been deleted four times should be reason enough to stop posting it.