I'm on the verge of deleting my Facebook account because of the utter lack of respect they give users who don't want all their information spewed about. The approach Facebook uses reflects and outmoded mindset that says "if you shared your information once, then clearly you've implicitly declared it public knowledge." Case-in-point: if you're a fan of a given page, other users can see your name listed as a fan, and thus Facebook considers this information to be "public" and will publish it in search results, among other things. Of course, there's still a difference between the Facebook populace and the Internet at large, so I somewhat question how "public" that disclosure might be. Incidentally, Facebook has not provided a reasonable facility (that I can find) that allows you to easily manage all the pages you're a fan of, meaning cleanup of publicly exposed information is a challenge. But I digress...
Following are a few quick suggestions for helping reduce the "public" exposure of your Facebook information, both inside and outside of Facebook.