Facebook is kind of like a blog for people who don’t blog. It has a big social resume section, something analogous to a blogroll. It also has something analogous to wordpress plug-ins. You can create a consolidated RSS Feed for all the events being generated by your friends on Facebook.
I think where Facebook is the weakest is in the way you can’t project multiple personas. I don’t want to list in the same resume my personal life and my work life. In my personal life I might be trying to date, but I wouldn’t want that to distract people who are trying to figure out who I am as a programmer.