It totally depends on the person, his social status, personality, and the place where he or she is living. For instance, a person living in the USA, where identity theft is a known issue, would value the information he is sharing online more than a person living in the Philippines, where identity theft is not so big an issue.
A celebrity or a politician would limit the amount of personal information he posts online. On the other hand, a lesser known person such us would not mind posting some personal info because in the first place no one would get them. Plus, FB has features that would allow users to make some information private. A non-friend will not be able to view personal information. So basically, you would have to be friends first to gain access to some info about a person.
FB does not share any other info to its affiliates without the user's consent. And I believe that falls under federal and international guidelines.
In sum, a user should be responsible enough for the information he shares online.If he does not like his personal photos to be downloaded by anyone, then he should not post it. If he does not like any article he has written to be copied then he should not post it. As simple as that.
Everyone's privacy is everyone's personal care.