Terminology:
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All articles are divided into 3 categories, with associated "popularity" index:

* Popular (popularity =  6) -- the top 10% of articles sorted according to the number of views
* Interesting (3) -- next 30%
* Regular (1) -- remaining 60%

Rating calculation:
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Rating consists of two numbers: 

* Basic (Public) rating -- for creation and editing of pages
* Social Rating -- for commenting on pages and other people's changes

Calculation of Basic Rating:
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* + (10 x Popularity) for creation of a page
* +3 for every user who gives positive comment on a change
* -3 for every user who gives negative comment on a change

*If there are multiple comments on a given change by the same user, only the last non-neutral comment counts for the rating*

Calculation of Social Rating:
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* +2 for a positive comment (to a page or a change)
* +1 for a negative comment