Categorization of Libraries
The categorization is based on the categorization of libraries in the paper
You are what you include
Ads
This category comprises all libraries which include the substring "ads"
Social Networking
This includes
Facebook connect
Google Plusone
Twitter widget
User experience
The only library in this category is JQuery. We consider that all scripts which URL includes the substring jquery is a JQuery library.
Tracking
This includes
Google Analytics
Libraries from yandex.ru with substring "metrika"