The population of Japan's blog is 8,880,000, the SNS population is 7.16 million

Both of them are the results of the Ministry of Internal Affairs and Communications as of the end of March 2006. By the way, six months ago, as of the end of September 2005, the blog population was 4.73 million and the SNS population was 3.99 million people, so if you look at it simply it doubled in almost half a year.
Number of registrants of blogs and SNS (as of the end of March 2006)
http://www.soumu.go.jp/s-news/2006/060413_2.html

The number of blog operators reflected in this calculation result is 53 companies, and the number of SNS operators is 21 companies. It might be fun to watch whether the service you are using is in.

Considering that there are some people who register accounts for multiple services by themselves, I think that in practice it will be less than Colle. Particularly in the case of SNS, there are not many connections between each SNS, so there are many cases that they are engaged in multiple SNSs.

Also, the Ministry of Internal Affairs and Communications announced in January this yearDocumentation of this PDF fileAccording to the current population of Japan in Japan is 79.48 million people. (Including internet access from mobile phones and game machines)

In other words, about 5.9% of the total net population in Japan opens a blog, about 5% feel that it is participating in SNS. Do you see this as more or less?