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“A December 2006 survey has found that 28% of internet users have tagged or categorized content online such as photos, news stories or blog posts. On a typical day online, 7% of internet users say they tag or categorize online content.”
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Dan Keldsen: ” taggable video feeds, this allows a video or audio content producer to ‘tag’ (embed or associate) bookmarks, transcriptions, or snippets, that allow a viewer/listener to jump between interesting spots in the content.”