The Powerhouse Museum* is using a mix of user-tagging & Reuters' Open Calais automated tagging system. Automated tagging seems to be getting better and better at identifying entities (people and things). What it cannot do is provide information on how the document is used by readers - which is where user-generated tags are powerful. One focuses on the stuff inside the document and the other focuses on the context outside the document. Both are necessary going forwards.
Thanks: James Robertson
*I don't know Seb Chan in his PHM guise but I do like his work as one of Sydney's best DJs and event promoters.
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