YandexBlog is a bot which is owned by Yandex (Russian search engine). The bot crawls web blogs, forums and RSS feeds that users add to their custom feeds-reader page located at http://lenta.yandex.ru/. Bot can be identified by user agent YandexBlog/0.99.101 (compatible; DOS3.30; Mozilla/5.0; B; robot) X readers, where X is number of users subscribed on current RSS feed or blog.
References
YandexBlog Wikipedia(Text) CC BY-SA