A little Internet research turns up 2 explanations for comment spam that contains
invalid links or even no links at all:
1: Some comment systems record the IP address of the commenter and use a sort
of "karma" system to combat spam. Leaving a lot of linkless comments could give an
IP address enough good "karma" to then deposit spam.
2: Spam with bogus "number" links (like "www.865425.com") could be trackable
"scouts". The spam-robot deposits a comment and then checks back later to see if
the spam is still there. The numbers let the robot keep track of where and when
the spam was deposited. If the scout spam has survived then the real spam will be left.
PS. I'm making invisible links on the bottom of the blog to any e-mail addresses I find on sites that spam me. The idea is that email-address harvesting web-robots
will find the links and then start spamming the spammers.














