Since I submitted the list of top 50 SEO blogs from blog rank to sphinn, I received a large number of emails asking me how does blog rank determines the ultimate rank calculation. So, here is the answer.
Currently, blog rank indexes and collects data for about to 20,000 blogs. You might notice that not all of these blog are displayed in the system. We wanted to work out more issues with algorithm before releasing more blogs. We currently use over 20+ different factors in determining the ultimate rank logic. Some of these factors include [this is by no means is a comprehensive list]:
1. RSS membership
2. Yahoo incoming links
3. Yahoo indexed pages
4. Google indexed pages
5. Google PR
6. Monthly visitors
7. Pages per visit
8. Link to page ratio
9. Compete Alexa,and Technorati ranking
12. social sites popularity (Digg first page stories, Stumbleupon reviews, Delicious bookmarks, Redditt, Propeller and mixx)
The factors of course are not all given the same weight. Factors which can be manipulated such as, incoming links and pages indexed by Google or Yahoo, have less weight compared to factors such as, pages per visit or RSS membership. Additionally, each blog receives different weight for the above factors depending on the category it is listed in, because it is measured against all the blogs in that particular category. For example, if a blog is listed under two categories: social media and blogging, it will most likely receive different points for RSS membership, Digg first page stories, Compete Ranking, etc in these two different categories.
Finally, batch data updates run for blog rank on daily basis. While we continue to tweak the ranking logic, we do not edit the ranking for any of the categories manually.
I am in the process of collecting all the questions I receive regularly for blog rank to create a FAQ. Please feel free to leave a comment here or drop me an email khalid at invesp dot com
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