FaceTag: Integrating Bottom-up and Top-down Classification in a Social Tagging System Facetag is a working prototype of a semantic
collaborative tagging tool conceived for bookmarking
information architecture resources. It aims to show how the
widespread homogeneous and flat keywords' space of tags can be
effectively mixed with a richer faceted classification scheme to
improve the “information scent” and “berrypicking” capabilities
of the system. The additional semantic structure is aggregated
both implicitly observing user behaviour and explicitly
introducing a compelling user experience to facilitate the
creation of relationships between tags directly by end-users.
Facetag current implementation is written in PHP / SQL and
includes an open API which allows querying and integration
from other applications.