A few select partner sites are beginning to roll out their integration with Facebook’s ID system through Facebook Connect. Last week, a CBS site was the first one to do so, and more are expected to go live soon. Digg will be one of them. (Other announced partners include Six Apart, ABC, CBS, Hulu, Kongregate, Loopt, Plaxo, Seesmic, StumbleUpon, Twitter, Vimeo, and Xobni). At the most basic level, Facebook Connect will let you sign into Digg and all of these other partner Websites with nothing more than your Facebook username and password. Facebook wants to become the universal ID on the Web, and any progress it makes on that front would be a big deal in its own right. But Facebook Connect goes well beyond an ID management system. Partners can tap into all sorts of social data people put into their Facebook profiles, and actions on partner sites can be reflected back on your Facebook News Feed in a Beacon-like manner.