I ran a study on Facebook that found many people did not understand their security settings (see www.syntagm.co.uk/design/facebookstudy.htm)
An interesting consequence is reported this morning by the BBC. A girl who intended to invite 15 friends to her 15th birthday party received 21,000 RSVPs. Read the story at http://www.bbc.co.uk/news/uk-england-beds-bucks-herts-11376350
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Of course if 21,000 RSVPed on Facebook, only 21 of them would have shown up. Great story.