I've avoided getting too enmeshed in Facebook, mainly out of concern for sharing personal information with Mark Zuckerberg.
Now, I'm feeling vindicated after reading Paul Bernal's blog post "10 reasons to leave Facebook..."
You can read his first reason below:
Everyone should be aware that privacy is an issue with Facebook. So many people put so much ‘private’ information onto Facebook that the possibility that your private information, photos, stories etc might get known to a wider public should be obvious. We shouldn’t be shocked when bad things happen – and yet even Randi Zuckerberg, sister of Facebook’s founder Mark Zuckerberg, still seemed surprised and upset when a ‘private’ family photograph she posted somehow made its way onto Twitter. It wasn’t hacked, scraped, leaked or anything nasty – it’s just that Facebook is designed that way. The private becomes public all too easily – ‘sharing’ means you lose control. If Randi had just emailed the pic to her family, or put it on a genuinely private site, none of this would have happened.