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2. "An Interview with Flickr's Eric Costello" by Jesse James Garrett, published on August 4, 2005. Quote: "Tags were not in the initial version of Flickr. Stewart Butterfield...liked the way they worked on del.icio.us, the social bookmarking application. We added very simple tagging functionality, so you could tag your photos, and then look at all your photos with a particular tag, or any one person’s photos with a particular tag."