Your link to your project is the most fascinating thread I have seen on HN since the thread about how HN was hacked, one of the all-time top karma submissions. But, amazingly, after playing around with your tool for about half the three hours that have elapsed since you posted it, I'm LESS worried about Facebook than I was before. Pretty much since I joined Facebook I have been posting links (including yours today) to my profile about Facebook privacy. Among my circle of Facebook friends, it is cool to have carefully considered privacy settings, and to be circumspect in what to post online. I have good conversations about interesting links on my profile and on my feed (much like HN), and didn't turn up ANYTHING by searching on my own name, my son's name, keywords strongly associated with my friends' interests, or anything else likely to turn up something we wrote out of turn. Now I'm actually beginning to trust Facebook privacy settings again--at least for smart users--after using your tool and the new Give Me My Data app
to see what can be seen about me on Facebook.
Great work to make such an interesting tool. And, yes, putting the "rectal surgery" example on your webpage is funny and gets the point across very well.