FC2

FC2 is based in Las Vegas, but appears to really popular (for some reason) in Japan, Hong Kong, and Taiwan. For the sake of comparison, the site is ranked 3rd in Japan, 30th in Hong Kong, 33rd in Taiwan, and 1,488th in the USA. This is more noticeable when a newcomer sees that FC2 appears to have more services available in Japanese than English.

More specifically, both Japanese and English versions have blogging, video uploading, free web hosting(!), social networking, and bulletin board services. The Japanese version, however, also has live chatting, cheap (250 yen, or ~US$3.11) 5 GB server hosting, domains, and shopping.

It is probably thanks to these services that the site is really popular in Japan.