"TagOntology is about identifying and formalizing a conceptualization of the activity of tagging, and building technology that commits to the ontology at the semantic level."
"They are built to be human-usable (...) are targeted primarily for storage/retrieval of personal information and serendipitous discovery of group information . (...) The development communities for each are abuzz with ideas for exploiting the structure"
"Of particular interest are its application to categorizing content in developing fields, and allowing the navigation of content sets by browsing. (...) social aspects and implications of these community-created systems are also of great significance"