Hatena Bookmark is a social bookmarking service. It is often colloquially referred to as Hatebu. The user can save the specific URL as a bookmark and tag it. They are able to interact with the other users through the tags, and can leave comments of up to 100 double-byte characters in length.
Hatena Bookmark counts the number of users per specific URL, therefore it is possible to see what bookmarks are popular among Hatena users. "Add to Hatena Bookmark" button is integrated into a lot of famous news sites, asahi.com, CNET Japan, ZDNet Japan, Nikkei ITpro, and ITmedia.
Read more about this topic: Hatena (company)