In Australia, Facebook is testing a new version of the news feed. On Friday, a large number of users noticed a selection of topics at the top of their news feed on both the desktop version of the site and its mobile app. Facebook had kindly put an instructional alert stating: "There's a new way to see a stream of stories that focus on a specific topic."
Facebook will initially serve users some default topics such as Animals & Pets, Politics, Travel, TV & Movies and Relationships. These default topics vary for different accounts. By clicking on the settings icon to the right of the topics, you can add and remove topics to suit your interests