ReclaimPrivacy shows what Facebook is sharing about you
The recent changes in Facebook’s privacy policies are civil rights eroding and a maze of complexity in my personal opinion. Even being careful, using this bookmarklet showed me I was still leaking information despite my best intentions at plugging all the holes. So, if you value your privacy I really advise using it to make sure you’re sharing only what you want to share (and particularly now that your friends can inadvertently share information about you you wouldn’t want being shared).

