Find taxonomies for many professional fields, industries, careers, academic fields, arts, literature, architecture, business, medicine, agriculture, engineering, much more...
Vocabularies for every academic, business, professional field, plus taxonomies for "Asian Vegetables," "General Knowledge," "Forbidden Drugs," and "Leadership."
You can tag arbitrary content on the web, you can do it in a low-tech way to make it easy for everyone to do...But...How do you find instances that people haven't tagged? Or deal with overlapping meme labels?