research: 40% of Japanese blogs are spam

Nifty Laboratory, a marketing research section of Nifty, which owns one of the biggest ISP in Japan @nifty, also provides big blog hosting service Cocolog, announced its new splog(spam blog) filtering technology combining several different splog finder methods.
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They also applied the filter to Japanese blog articles, sampled 100,000 for each month from their 450 million article archives (which they claim 90 % of Japanese blog articles). The result is, averagely 40% of blog entries are spam in Japanese blogosphere.
Japanese blogosphere is known the biggest in the world by numbers, as reported often on Technorati’s quarterly State of the Blogosphere report.

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