For most of computing history, interfaces have been about function. Word processing programs help you compose documents. Banking websites help you make transactions. Sites like Flickr help you display and share photographs.
But Facebook’s Timeline (the new version of the user profile which is slated to be released to the general public "in the next few weeks") wanted to do something more: It wanted to convey a feeling. Two feelings actually: The feeling of telling someone your life story, and the feeling of memory—of remembering your own life.