Interesting fact about Japanese being the #1 language for blogging:
There are more blog posts in Japanese than any other language, according to Technorati Inc., which tracks nearly 113 million blogs globally. Last year, Technorati found 37 percent of all postings were in Japanese — about 1.5 million per day. Postings in English — from Americans, Britons, Australians and people in many other countries — accounted for 36 percent of the total.
The original article is here, though it is on a different topic.
I suspect that Chinese is also high on the list. Here is a book on Blog marketing in Chinese that I found in a Taipei bookstore:
Technorati information page: