This is for the bloggers in the audience; everybody else can safely ignore!
A few months ago, I started noticing odd comments on slightly older (like two or three months) UH posts - They weren't immediately obvious as spam, but the English always seemed to be slightly off, and there was always just a single link to some spammish-looking site that really had nothing at all to do with Boston or the topic of the comment.
Yeah, it's spam gone retail. Lookie here - you can pay somebody to post blog comments for you. Only $19.99 for 100 comments, such a bargain!
They purely appear like completely natural comments written by someone just reading the blog post. Even you wont be able to distinguish our blog comments separately form others. In spite of this, most of the bloggers/moderators always love free comments to keep their web content fresh and their community alive.
I found the link on a forum site that discusses such techniques - which I discovered when I noticed a bunch of links from it to an older UH post, given as a great location to post just such messages, since I don't use "nofollow." Sure enough, a couple of these nouvelle spams showed up on that post. The delete button is such a handy thing.