It's stealth marketing. Which is just another kind of spam (more annoying IMO, since it "pretends" to be relevant). Get rid of it if you have a no-spam policy.
We get it on here too...someone posts a comment that sort of pertains to a Greek or other topic, but then all their other posts are about a movie that's coming out or something of the like. They get gone quickly as this is one of my pet peeves.
