Folksonomies
Folksonomies are used to categorize Web pages, photographs, links and other Web content by using labels, called "tags," which are chosen by the user. The information can be retrieved later on by using these tags.
Tagging
Tagging is giving a search term(s) or key word to a web page, photo, video, blog entry, or other Web content in order to make it easier to find. Tags are labels that allow users to associate information with particular topics
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Activity