The problem with making your blog the hub of your social network is that there is no concept of private groups or private friends for a blog. Everything is public. <p>The post gives an example of uploading photos, and then automatically notifying friends via RSS that new photos are up. Sounds like Facebook, except on Facebook, only my friends could see the photos, not the whole world.<p>I don't think you solve this problem until there is an Internet-wide system for managing your identity. (Obviously, OpenID and OpenAuth are steps in this direction.)<p>Plus, I also think that it is psychologically more difficult to start a blog than it is to create a profile page on a social network. With a blog, you have to overcome the "Blank Canvas Fear" ("What am I supposed to say?") and the "Public Speaking Fear" ("I'm speaking to the whole world, not just my friends.") Filling out a Facebook profile and writing on your friend's Wall is a much easier way to start.