MEDIA MATTERS. Welcome to the Blogosphere | PBS.
as i research more, i find too that PBS DID A DOCUMENTARY ON BLOGS!
Cyberspace's most dynamic journalistic innovation may be the "blog" or "Web log" -- an electronic diary of personal commentary. The "Blogosphere" is expanding so rapidly (estimates of the number of American bloggers range from 200,000 to 500,000) that MSNBC.com just replaced its highly successful discussion boards and their 600,000 posts per day with "Weblog Central." It posts its own blogs and provides a weekly list of links called "Best of Blogs."