First, you should really go back and view this graphic about the evolution of Facebook privacy settings, and how ever-more information is shared with everyone.
Then, you should read the following exchange Facebook founder and CEO Mark Zuckerberg once had on IM:
ZUCK: yea so if you ever need info about anyone at harvard
ZUCK: just ask
ZUCK: i have over 4000 emails, pictures, addresses, sns
FRIEND: what!? how’d you manage that one?
ZUCK: people just submitted it
ZUCK: i don’t know why
ZUCK: they “trust me”
ZUCK: dumb fucks
That doesn’t exactly instill confidence in your privacy, does it? This was from a few years ago, and Zuckerberg and his defenders say he has matured since he was a young college kid. Maybe. But if you ask me, a billion dollars to a young man usually doesn’t speed up the maturation process that much.
That IM exchange is reported in this profile in the New Yorker on Zuckerberg. All this accompanies an upcoming film written by Aaron Sorkin (aka the West Wing creator and main writer) that comes out soon. It’s (cheekily) called The Social Network.