These have been around for ages in magazines, but there seem to be even more of them recently on Facebook (sometimes posted from a third-party site). Some of the suggestions/questions are harmless, but I've noticed there are a few floating around like: "for your rock star first name, use the name of your first pet", or "your mother's maiden name". As in, on this public forum under your full name, please post what you use as an answer for security questions for your bank, email, etc.
Even if the 3rd-party site isn't involved, you can bet someone else is scraping that data.
I'll be having a word with my family and friends...