50 million unique visitors on blogs in Q1 2005: "Blogs are quickly approaching the status of a mainstream media" according to comScore

Comscore has just released a survey (that Six Apart sponsored but of course without any influence on the results) that was based on data produced using comScore's panel of about 2 million Internet users. The survey is available as pdf under the title of "Behaviors of the Blogosphere: Understanding the Size, Composition and Activities of Weblog Readers". Here are the key findings:

-50 million U.S. Internet users visited blog sites in the first quarter of 2005. That is 30% of all U.S. Internet users and 16 % of the U.S. population
-5 hosting services for blogs each had more than 5 million unique visitors and four individual blogs had more than 1 million visitors each

According to comScore, the typepad.com and blogs.com domains combined reached 9,5 million unique visitors and the audience growth from last year is +240%.