Actually, the better practice for posting any links is to post the link with either a short description of the content, and/or a comment about the content.  Another thing is to provide a short snippet about which portion of the substance of the link that you would like to make a comment... In any event posting links should be accompanied by some kind of comment that shows why you are posting such link (rather than the link by itself). 

I completely agree that it is annoying as fuck to see the substance of a whole post copied and pasted, without any reference to why you are posting it.. and even if you reference why you are posting it, you frequently do not need to copy and paste the whole thing.