What is a Folksonomy?

Folksonomy is a coined word, which is derived from the most unique custom tag function in the social bookmarking service. Folksonomy = Folks + Taxonomy, Folks is a more spoken word in English, which means a group of people, a group of people. Taxonomy refers to taxonomy, which is an important part of the Information Architecture. Folksonomy refers to the flat non-hierarchical label classification defined by the "volunteers" spontaneously. I call it "Focus Classification", and some people interpret it as Social Classification.