The rule that I have been trying to follow is that if I don't know what the hell you are talking about based on the original post, I am going to delete it. Obviously, I am not seeing every new thread, but that applies for the ones that I do see.
I am less concerned about a link than I am about the original post containing sufficient information. A couple of words and a link is just as bad as a few more words and no link. I think that if someone is going to start a thread, they should be sufficient effort into explaining exactly what it is that they are talking about.