This is a great post, and I suggest everyone read it. Many of the issues we've discussed here are also brought up there. One of my favourite parts:
This issue of ownership is much bigger than Six Apart and Livejournal, because it's really about how we as a culture construct the new class of relationships between citizens and businesses that is embodied by the interactive, hyper-connected social nodes that form the new structures through which modern humans are organizing our public lives.