Most of the dozen or so spam comments I delete every day consist of little more than gibberish. At best, a spam comment will have a poorly worded paragraph or two touting pharmaceuticals, handbags, shoes, or other junk, with absolutely no relation to the post. It’s easy to tell they’re generated by a script: keyword-heavy verbiage, bogus usernames, junk websites, and so forth and so on. Boring, is what they are.
Recently an interesting comment appeared in response to that post on KG-UV3D audio levels which Akismet tagged as spam:
The microphone and radio matching capabilities are terrific. Adjust the wide-range input level for optimum drive to the built-in microphone amplifier […]
Fluent, idiomatic English that started out pretty nearly on-point for the post! The rest of the comment sounded like advertising copy, though. Well written ad copy, but ad copy nonetheless. Feeding a representative chunk into Google produced a link to the description of the W2IHY Two-band Audio Equalizer on the Official Website.
Now, as it turns out, Julius lives up the river from here and I’ve met him several times. I also know he’s not spamming me, because the URL associated with the post points to some weird-ass Angola gold mining fraud that’s all too familiar from previous spammage. Oh, and the IP address resolves to a Tor server.
As I observed there, eventually the spammers will become bright enough to hold an intelligent conversation and then they’ll be provisionally human. Depending on what they want to talk about …
The Smell of Molten Projects in the Morning 
“Bogdanov Affair”
“The Bogdanov’s [sic] papers consist of buzzwords from various fields of mathematical physics, string theory and quantum gravity, strung together into syntactically correct, but semantically meaningless prose.”
http://en.wikipedia.org/wiki/Bogdanov_Affair
Let’s do some “computer science”…
“SCIgen – An Automatic CS Paper Generator”
http://pdos.csail.mit.edu/scigen/
That covers most of the incoming junk!
I’ve read stories describing how we might train an AI by having it write junk mail; when the recipients no longer tag its messages as spam, then it’s effectively human. The evidence so far says they’re not even close to the mark…
I assume you’re familiar with http://xkcd.com/810/
Absolutely!
It’s actually how we raise people: train ’em up right and they tend to be more useful later on.