Facebook launched some "lifestream" integration features on April 15, 2008
The option to import stories from other sites can be found via the small "Import" link at the top of your Mini-Feed. Only a few sites—Flickr, Yelp, Picasa, and del.icio.us [and now Digg]—are available for importing at the moment
Facebook Blog - A new way to share with friends
Sidebar: Facebook also seems to have silently taken away the feature where you could X stuff out of your News Feed, which was supposed to teach it to only show friends items that interested you, over time.