You are basically going to have play with your own privacy settings to understand how it works. (A second way would be to compare the appearance of the profile on your account versus a next account , yes ...very obvious)
Once they are signed up there is nothing you can do about it (minor or not)
We appreciate your concern for your
child's use of our website, but
unfortunately we cannot give you
access to the account or take any
action on the account at your request.
We are generally forbidden by privacy
laws against giving unauthorized
access to someone who is not an
account holder. Please note that all
users ages 13 and older are considered
authorized account holders and are
included in the scope of this policy.
We encourage parents to exercise any
discretion they can on their own
computers and in overseeing their
kids' internet use. If you are a
parent, you might also consider using
software tools on your own computer in
order to do so. Please do a search for
computer-based Internet control
technology on your preferred search
engine to discover options that you
may wish to pursue.
Please also talk to your kids, educate
them about internet safety, and ask
them to use our extensive privacy
settings.
http://www.facebook.com/help/?faq=16104
Some signs that they are blocking you.
- Cannot see the wall tab
- Clicking on View more Photos only results in one photo
- Ability to mention with the @ sign
- Cannot send messages
For individual wall posts that would be tricky and I would say you are stuck. Someone can comment and provide a suggestion for wallposts.