I know once upon a time I defended us allowing noob threads when Something Awful attacked us about this issue, but I'm beginning to get absolutely sick of seeing five of these a day in the General Chat section. It's really diluting interesting conversation.
Sure, it is nice to introduce yourself, but there are better ways to do it than just making a sole thread dedicated to a nooby saying "Hi, I'm new!". A good way to get noticed on this site is to jump into a thread on an interesting topic, and provide your incite.
My recommendation is to either ban these kind of threads, or make a single sticky thread in the General Chat section where you can introduce yourself.