multi-user blogs

Hi,
I would like to know what modules are used in The Economist Drupal 6 websites: http://www.economist.com
Also I would like to understand how are managed the Channels and Blogs Structures.
And also How are managed the subscribed content?

I think we could learn a lot from The Economist website. It is a great project.

Can you help me?

I've been trying to figure this one out for over a week now so thought I'd come to the Group to see if anyone might be able to offer a solution.

I've attached screenshots of my settings to hopefully make it easier to understand.

Images

I've enabled the built in System Page (blog_user) that allows a User's blog posts to be easily viewed. I chose a Flexible panel and put 3 Views inside, (user_posts, User being viewed, and User Tweets). That part was simple enough and great built-in functionality.

I also added a shot of the View a reference.

The Problem