Facebook Chief Executive Officer Mark Zuckerberg said the U.S. Internet giant was launching a feature called Timeline to upgrade users\' profile pages. \"It\'s the story of your life,\" Zuckerberg said at a Facebook developer conference, referring to the new layout that is designed to make it easier to view and organize the profile pages where users post information about themselves, The New York Times reported Thursday. Timeline allows users to store content in three sections: photos, events and applications, the Times said. Zuckerberg said changes were needed due to the company\'s fast growth. He noted that Facebook last week broke a company record by having a half-billion users in a single day. Facebook also said it would make changes to the Open Graph feature. One of the changes will create links to applications a friend might be using, so the friends can, for example, listen to a song at the same time.