Generally speaking, if you are accepted as someone's friend on Facebook, you can view their private wall.
Users can also choose to place their friends on a restricted list. This means they would like to hide their posts and private information.
The best way of viewing a person's private wall is to request their friendship and earn their trust. However, people can be very private about their life, or even self conscious and this should be respected.
There have been reports of ways to view a restricted wall without their permission but Facebook will work to quickly resolve any loopholes in their privacy terms to protect their users.
