I saw those too. I noticed that most spam threads seem to have just one sentence (no punctuation whatsoever, other that that one "." at the end), followed by "For more information, visit this site >>>>>>> [insert link]" or something like that. Maybe it's the same spammer every time (using multiple bots), because they always seem to talk about random "skin care/anti-aging" products. However, the spam posts usually get deleted within a day or 2, so you don't have to worry about them overloading the site.
I wonder which galaxy (in the observable universe) looks the most like the SW Galaxy. I bet they can see ours.