Yeah, it is. I think a lot of it is because of some guy called tetsuoswrath, who seems to have gotten an unbelievably huge number points in a short amount of time, so everyone assumes he's using alts. You also might be seeing some remnants of the latest porn spammer. We haven't had one in a long time, though.
You're lucky, actually. The site's been tightening restrictions to thwart trolls; a few months ago it was a lot worse.