TechCrunch ran an article about Pipl, a really cool people finding search engine. I’ve known about it for over a year because we get a half dozen visits a month from them. If you ever wanted to know anything about anyone, don’t go to Google, go to Pipl instead.
That said, some corners of fandom has a lot of privacy issues. If you’re concerned about yours, definitely check it out because you might not be aware of how much you’re leaking out that you didn’t know about. That includes public records that governments have made available. And after you’ve done that, go and make sure your fandom friends know so that we people are made aware so there aren’t any future outings like the one in the Supernatural fandom as a result of people’s ignorance about the Internet and how it works.