Another unreleased social plugin is called Social Context.
It takes a list of keywords, finds related Facebook brand pages, and renders a list of friends who like that brand.
Obviously, the pages returned will depend on your social circle. I’m not entirely sure of the use case for this yet. Along with keywords, the plugin can use URLs, or a Facebook object_id, although these don’t appear to show any results.
I’ll keep exploring the possibilities of this plugin.