| http://www.w3.org/ns/prov#value | - Although the social tagging has some drawbacks such as people can tag an item in many different ways (Farkas, 2007), it is applied at many different type of websites and content such as Del.icio.us for bookmarks, Flickr for images, Technorati for blog posts, CiteULike for academic papers, or LibraryThing for books (Chang and Wang, 2011).
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