The friend and best friend relationships are person relationships.
Friends are members you know in real life or have spent a lot of time getting to know on V-TIP.COM as fans or contacts. A friend is someone you trust. As a result, friends have the second highest privileges.
Best friends are members you know in real life and have a long term relationship with. They have the highest privileges and should be members you trust implicitly.
Friends and best friends can view private profile pages. Best friends can view private media.
There are very few things you can hide from a best friends. Only hidden media and hidden profile pages are not accessible to best friends.
To learn more about privileges see the relationship FAQ.