One blog created 'every second'
In its latest State of the Blogosphere report, it said the number of blogs it was tracking now stood at more than 14.2m blogs, up from 7.8m in March.
It suggests, on average, the number of blogs is doubling every five months.
Blogs, the homepages of the 21st Century, are free and easy to set up and use. They are popular with people who want to share thoughts online.
They allow for the instant publication of ideas and for interactive conversations, through comments, with friends or strangers.
Technorati is like a search engine that keeps track of what is happening in the blogosphere, the name given to the universe of weblogs.
It relies on people tagging - giving keywords to - their blogs or blog posts so that its search engine can find them.
Free blogging services such as those provided by MSN Spaces, Blogger, LiveJournal, AOL Journals, WordPress and Movable Type were also growing quickly, said the report.
Thirteen percent of all blogs that Technorati tracks are updated weekly or more, said the report, and 55% of all new bloggers are still posting three months after they started.
It also pointed to the growth in moblogs, blogs to which people with camera phones automatically send pictures and text.
The voices in the blogosphere are also sounding less US-centric, with blog growth spotted in Japan, Korea, China, UK, France, and Brazil.