Library classification systems are taxonomies which are shaped by socio-cultural dynamics and that restrict the ability to represent indigenous voices and/or voices from under-represented groups. A folksonomy is a user-created classification system. It provides the ability to expand library taxonomies. It is based on collaborative tagging (social tagging). Creating a folksonomy could be a great way to supplement library catalogs. More on folksonomy.
Use this spreadsheet for your folksonomy project.