Here we have the concept of a "friends list".
By adding other users to your friends list, you can easily keep
track of what is going on in their lives from your friends page.
Friends aren't limited by individuals, you can add communities and
syndicated feeds to your friends list as well.
Create, edit, or delete sub groups of your friends. These friend groups can be used to filter your friends list: you can
pick a specific friend group to view.