Our focus is on providing web services with user-generated content such as Hatena Blog and Hatena Bookmark, the top Japanese social bookmarking service.
We also offer a wide range of services using leading technologies targeting business users. This includes Mackerel, a server monitoring platform (our newest product); Hatena Blog Media, an owned media CMS for content marketing; Brand-Safe Hatena, an ad-verification service; and more.

Link：http://hatenacorp.jp/