Facebook today officially launches several improvements to its Friend Lists feature that can be used to define privacy settings and filter the news feed, including some changes that leaked last week. As we covered in depth then, users now have automatically created, populated and updated Smart Lists of their family, co-workers, classmates, and local friends. Additionally, users can now add friends to an “Acquaintances” list whose members will appear less frequently in the news feed, and a “Close Friends” list of people who will appear more frequently in news feed and whose updates will trigger notifications.

via Facebook Officially Launches Smart Lists, and Special Friend Lists That Influence the News Feed.