Jennifer Golbeck writes:
… We spend a lot of time thinking about what to post on Facebook. Should you argue that political point your high school friend made? Do your friends really want to see yet another photo of your cat (or baby)? Most of us have, at one time or another, started writing something and then, probably wisely, changed our minds.
Unfortunately, the code that powers Facebook still knows what you typed – even if you decide not to publish it. It turns out the things you explicitly choose not to share aren’t entirely private.
Read more on The Age.