Spam comments are the bastard children of spam emails and naive young comments sections, loved by neither parent these comments are to be pitied as much as despised. Also, they will probably destroy humanity.
There are two distinct schools of thought on how to combat spam, there is the traditional school and the Cracked school.
The traditional methods generally involve deleting the comments once they appear, banning the accounts posting them and blocking the copy/pasted text. These are the tried and tested methods used by many websites to combat spammers.
The methods advocated by Cracked are somewhat different in nature. Our method is rather more direct, usually involving chainsaws. Of course we're not suggesting that the next time you see a spam comment you should attack your computer with a chainsaw... Actually, screw that, that's exactly what we're suggesting because that would be AWESOME.