Unless they sell some sort of Sheeva plug with everything already installed (with configuration and automatic updates). That could be easier than Facebook. An

Unless they sell some sort of Sheeva plug with everything already installed (with configuration and automatic updates). That could be easier than Facebook. And they wouldn't need the critical mass: the plug computer could come with a blog engine, bittorrent (client and tracker), a mail server for the family… It could be the Eben Moglen's freedom box that inspired them to start Diaspora in the first place.