title: In Wordpress MU, how to allow users to register for new blogs with their existing account?
body: <p>In Wordpress MU, how can I allow users to register for new blogs with their existing account? Right now, it seems that the site admin has to manually add them at the admin page. That would be fine with me except that the admin for the entire site will have to manually add users to blogs one by one. With hundreds of blogs and hundreds of users, that could become a full time job in itself.</p>
  
  <p>Or better yet, how can I cause existing users to be automatically registered under a set role for all newly created blogs under this site? That would be the holy grail of functionality for my website. Thanks.</p>