Predictably, most of the spam I get seems to consist of people trying to link to other websites, where one might, for instance, purchase mis-spelled variations of prescription drugs (especially of the supposedly "manhood-enhancing" sort), download viruses disguised as virus-protection software, or look at pictures of what can only be described as "disturbing barnyard scenes".
And while all that is certainly obnoxious, I can at least see a "purpose" in the comments -- that is, the commenter (or comment-bot, as the case may be) wants people to click a link and go to their site, which presumably will result in someone, somewhere, making money.
BUT: there's also another variant of spam going around that utterly baffles me, as I don't see any purpose to it whatsoever. These spam comments indicate no identities (meaning they're generally posted "anonymously"), contain no links, and mention nothing that to me even remotely suggests a product someone might be trying to sell.
For example, I just deleted two comments that read as follows:
(1) "Brim over I acquiesce in but I think the collection should prepare more info then it has."
(2) "Opulently I to but I contemplate the post should prepare more info then it has."
(Which remind me a lot of the output of Racter, one of the first "computer games" I ever played as an elementary-schooler, and which I think employed some sort of Markovizing algorithm.)
I also recently received a comment along the lines of, "Excuse me, but can you tell me where I can buy a unicorn?", which I know several other folks received as well.
So, anyway, this kind of thing? I don't get it.
I know it's not that important in the grand scheme of things, but it's so danged weird I wanted to ask around and see if anyone knew what purpose comments such as the above examples could serve.
I am thinking maybe something to do with loading search engine results / messing with keywords, but I can't see how the indicated comments would actually serve that function.
(And remember, this is NOT a case of people commenting nonsense but then embedding a link in their comment -- I get those ones too, but in that case it's clear they at least go somewhere. The ones I'm talking about do not contain any links, or any URLs, or any clickable identity tag -- they're just plain text that doesn't make any sense).
Many thanks to commenter Raoul, who explicated thusly:
The bots leave them in as many places as they can. Later they poll Google for that specific phrase.
Hits on the Google search will be sites that are (a) indexed, therefore can help generate PageRank, and (b) poorly maintained, 'cause the nonsense spam didn't get moderated away or erased.
So the bots go back for a second round, leaving the real linky spam in places it will fester longer.
(In other words, I think the mystery is solved!)