Facebook – Blocking people on Facebook without flagging them as spammers

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.

If you'll go to the Privacy Settings, on the bottom you will see a Block Lists section, where you can Edit your lists of blocked people and apps. From there I guess you'll see your friend's name somewhere.