Many people have complex privacy needs which are poorly met by current social software design. People may want to show one facet of their identity to their boss and another to their friends and yet a third one to their family. Most social software currently asks you to explicitly manage your privacy by manually assigning people into discrete groups but this only poorly models how humans actually negotiate complex identity presentations. Friendbo is an attempt to build a more humane privacy interface by controlling access through the ability to answer personal questions.
For more details on Friendbo, see: http://www.friendbo.com/