@sozobe,
We may well be seeing the early days of an attempt to use bots to generate content. The accounts which have been opened here were first speculated upon as being bots because of the boilerplate nature of the "introduction new member" threads. Since that time, there has been some rather strange posting--Jespah has caught several of these instances. One of these accounts will express an interest in a topic, more or less asking a question. Then Jespah comes along an points out that the very same account has already once posted a detailed description of the subject in which it has subsequently expressed an interest. Obviously, there's a lot of bugs in their system.
However, this is not the usual call and response attempt to get viral marketing going. So far, as far as i've seen, the jokers never come back with a link. With human supervision, though, it could be very effective if they ever work the kinds out. The human writes the content, and then bot A, which is registered at several different sites, goes and drops off the content. Meanwhile, human is writing content for bot B, and so on, and so on . . .
It bothers me that they're attempting to make it sufficiently plausible that one might not spot the bots. There are several telltale signs of a bot that they show, but i'm not posting it here for the jokers to come learn how they're tipping their hands.