Gotta say, it really bugs me to know that people would willingly download a script they don't understand and run it against their private data.
Sure the javascript is open source, but how many people will actually read and understand it before running it?
Not saying that this specific script or post has any nefarious intent, but it's obvious how easy it would be to trick a bunch of otherwise intelligent people to give away access to their facebook account by posting something that claims to protect privacy.