This may not have value to you if you do not read Japanese, but this widget does introduce us to the various Japanese bookmarking sites. Each icon is a link to another social bookmarking site. If you have an account, you just log in and can directly post a link to your website. The code is easy to spot on the webpage.

Displays icons for a whole bunch of English language and Japanese popular bookmarking sites. The icons are links to that site. Put this widget on your blog to increase your SEO. Code is easy to find on the widget's website.