In June 2003 Blogcount estimated that there were between 2.4
million to 2.9 million active blogs. As a point of reference that is
around 10% of the number of dot-com registrations (although most
blogs do not have unique domain names). Blogcount attributed over
Google Search
this site
the web
related
Guides:
E-Publishing
Censorship
Design
Accessibility
Metrics &
Statistics
1.6 million active users to the three largest centrally hosted services