The loose tagging that people do in personal indexing of articles can be mined to reveal facets as we see through this article - "This paper illustrates how a facet analysis of a broad folksonomy based on the postulational approach can reveal underlying conceptual categories and facets to which the folksonomy's aggregated tags belong. In this way, facet analysis techniques are used to manually expose a faceted classification ontology in the flat tag space, thus revealing user-generated relationships between information items. "
Postulational approach (in case you are wondering) "to facet analysis refers to a methodology used for both the creation (by a classificationist) and subsequent usage (by classifiers) of a faceted classification scheme."
The study used data from Library Thing, a social networking site for people to catalog their book collections. From an analysis of tags to 76 history books emerged two universes: book and subject, and out of these a discernment of facets that was aided by using the Ranganathan framework of Personality, Matter, Energy, Space and Time.
Of interest, especially to librarians, is this conclusion - "As will be discussed, the inclusion of users in a faceted classification may provide novel ways to personalize faceted navigation. "
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