With the Friends Plugin for WordPress you can now consume content your friends (or other blogs) create, and interact with your friends on their blogs with seamless authentication.
With added parser support through plugins you can subscribe to all sorts of content, also on other social networks, allowing you to see what your friends do across social network borders.
A “friend” in the Friends Plugin doesn’t need to be a real friend, you can also subscribe to any site you like and that for which a viable means exists to retrieve the content.