Bloggers Rating: How and Why
Let me quote a piece of speech of Anton Volnukhin published in Yandex corporate blog.
... as in the big Yandex search, in addition to external link factors, internal ones are also taken into account - the characteristics of the blog itself. They are also many, and they also have different weights. Here are the most important ones: the blog’s existence, the average activity of its author, the current activity of the author, the number of blog readers (readers both through friend-feed and via RSS feeds: Yandex.Tape; syndication in Livejournal; FeedBurner data is also taken into account for offline blogs .com if the blog is broadcast through it and the readers statistics are not closed). But, again, these factors are not basic, they only complement the basic formula, making it more stable.