Popularity of tagging

The Pew Internet and American Life Project has published the results of recent research into the popularity of tagging. To quote:

A December 2006 survey by the Pew Internet & American Life Project found that 28% of internet users -- and 7% on any typical day -- have tagged or categorized online content such as photos, news stories or blog posts.

These are people who responded "yes" to the following question: "Please tell me if you ever use the internet to categorize or tag online content like a photo, news story, or a blog post." The survey wording was designed to capture the growing use of tagging on sites such as http://del.icio.us/ (a site for sharing browser bookmarks), http://www.flickr.com/ (a photo sharing site), http://youtube.com/ (a video sharing site) and http://technorati.com/ (the blog search engine).