Facebook added new embeddable widgets that let admins of Facebook pages or applications share their Facebook activity streams on other websites. The most exciting is the “Live Stream Box,” works two ways, using tabs to switch between them. Friends mode displays your Facebook stream the way you’d see it, with all of your friends’ latest updates. Everyone Watching mode shows you the activity of other Facebook users who’re also viewing the page where the widget’s embedded. There’s also a Fan Box that shows the stream of your fan page, and people can like and comment on posts using the widget.
More info: Facebook Widgets