Blogs are mainstream media. About 30 million US Internet users (14% of the Internet population) have a blog they update at least once a month. That number is expected to grow by 25% in 4 years.
Even more important than the number of bloggers, is the number of blog readers. eMarketer estimates that this year, 96.6 million US Internet users will read a blog at least once per month. By 2013, 128.2 million people, or 58% of all US Internet users, will do the same.
Blog sites now touch tens of millions of people in the US.