UI design: When tags work (librarything.com) and when they don't (amazon.com)(librarything.com)
librarything.com
UI design: When tags work (librarything.com) and when they don't (amazon.com)
http://www.librarything.com/thingology/2007/02/when-tags-works-and-when-they-dont.php
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Amazon: ~1.3 million tags.
LibraryThing: >13 million tags!