Sometimes the contradictions of the modern world startle me, and this is especially true when it comes to social websites like Facebook and MySpace (and, to a lesser extent, Flickr).
Quite why some people feel the urge to tell the whole planet minute details of their lives is beyond me, especially considering that in general these people would not tell those details to total strangers in public.
But here we are, people give out information that in general is considered as "top secret", and it's there for all to see... Maybe some people think that being in a huge crowd (after all, Facebook has millions of users) is the same thing as being anonymous.
It's not. I recently talked to a law enforcement officer, who told me that Facebook really is their best friend when it comes down to crimes committed by people under 25.
All they have to do is look up the suspects' names on Facebook, and they will know who their friends are. A bit of "social engineering" will get them in their friends' circle, and then a huge amount of information becomes available to them, allowing them to know who was where and when... Case closed!
Don't even get me started on identity theft (or simply theft, since a thief can know that you're on holiday and even get your address by reading your profile, if you leave it as "public"...)
Me, I'll keep shredding the information I don't want others to read...