seeking comfort in numbers, I followed Voidspawn's advice to heed the number of lurkers.
To my surprise, there was an unusual number of members, most with female-ish names.
I checked three of them, and they had all joined yesterday, 11. of September.
Looking into the "About me" section of their profiles, all the homepages seemed to be (more or less random) blogs from Poland.
Is some "increase your home page hits" algorithm sending random membership applications ...?