I'm looking for software that allows group blogging and social networking?

I'm looking for something that combines the group blogging ability of tools like Wordpress, with the social networking aspects of tools like Ning. I want dozens of registered users to be able to blog and comment, and also have user profiles like LinkedIn that show the connectedness between people. Pligg is close, but is more focused on voting about articles. Any suggestions? Free or not free is fine, but I want to be able to host it on my own domain, so I don't think Squidoo or Zimbio will

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