It can be used by many other services like
- making a badge you can see right sidebar of this blog
- Eyes on Tibet tumblr for archiving
- start page service like iGoogle, My Yahoo, netvibes (see the Yahoo pipes page for detail)
No need for "center" of the movement. Bloggers write entries just as they do everyday. They can write about not only political themes but also musics they like, programming, net services they use, lunch menus they cooked for or ate with their partners. Their blogs have no unique goal just as their everyday lives but some part of them aggregates and generate a big common concern and can be shown as a "Eyes on Tibet today" page.
And you can use the generated results any way as you like.