to understand folksonomy: https://www.lifewire.com/what-is-folksonomy-1616321

A folksonomy is a system in which users apply public tags to online items, typically to aid them in re-finding those items.

https://en.wikipedia.org/wiki/Folksonomy

Folksonomies – Cooperative Classification and Communication Through Shared Metadata

http://www.adammathes.com/academic/computer-mediated-communication/folksonomies.html

http://www.threadwatch.org/node/1206

Folksonomies and Social-Tagging

https://theidaholibrarian.wordpress.com/2012/11/13/social-tagging-2012/

http://www.nytimes.com/2005/12/11/magazine/folksonomy.html

Studying Social Tagging and Folksonomy: A Review and Framework

https://journals.tdl.org/jodi/index.php/jodi/article/download/269/278

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more on metadata in this blog
https://blog.stcloudstate.edu/ims?s=metadata