This category is part of WikiProject Websites, an attempt to create and link together articles about the major websites on the web. To participate, you can edit the article attached to this page, or visit the project page.
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Category membership is there to build useful navigation paths. It's never an ontological definition, and it's a mistake to rely on it as such.
Folksonomy as a neologism dates from the web 2.0 era (either 2001 or 2004, depending on whether you credit Vander Wal as its inventor).
Folksonomy as a technique relies on the mass collaboration tools that were brought into existence by web 2.0. Although it's no doubt possible to work on a folksonomy without, it restricts the ease of doing so, and particularly the size of the group involved. Card sorting and focus groups pre-date web 2.0, but they are traditionally limited to a roomful of people.