Image by jdlasica via FlickrIt was easy to do. All you needed to do was go read the official Facebook blog post about it. The post told you where to go if you wanted to get in right away.
Call Your Friends Right From Facebook
Otherwise earlier in the day I complained I felt excluded.
Mark Zuckerberg is right. Facebook has the huge advantage that it has the social graph. Google might have to struggle to rebuild that graph. But I see me using both services.