I succumbed to temptation and went egosurfing. Most of the hits arise from my name appearing on each of my blog entries, and a lot of others from my posting comments in various places... but I was surprised by one entry, which purported to be my profile on "Sexy Celebrity Gossips"!
It showed my blog for my web page... most of the items were unknown. I didn't think I'd signed up, but it claimed I'd registered early in March, and posted shortly thereafter (but not since). Well... maybe I had signed on to it, but I had no idea what password I'd chosen if I had--and when I gave it my email address after clicking on "Forgot password?" link, it said it had never heard of such an email address before.
My guess is that it's some kind of scam--maybe the whole thing is to lead people to enter that email address, thinking that maybe they had registered, to give some spammer a source of live email addresses. Goodness knows that there seems to be quite a few places that somehow generate pages with many common search terms on them and that direct you thence to whatever porn site they're pushing.
My answer to the question, then, is "none of the above."