Collabo.com

Almost a year after stating the intention, Digg follows through with implementing Facebook Connect, which allows Facebook users to skip the registration process and log into partner websites (such as Digg) with their Facebook ID, relying on their trust in Facebook’s authentication. One benefit for partner sites is in allowing users to quickly interact with their site and share branded content back to Facebook friends. Partner sites can also reference information from a user’s Facebook profile to tailor content specifically for that user based on criteria such as location, interests, etc.