How it works: LibraryThing analyses the more than forty million books and fifty million tags LibraryThing members have added, and comes back with reading suggestions.

Viestit:(1) "Books with similar library subjects and classifications" mines what LibraryThing knows about library-assigned subjects (mostly Library of Congress Subject Headings), Library of Congress Classifications (LCC) and the Dewey Decimal Classifications (DDC). (3) LibraryThing's suggestions are © 2005-2007 LibraryThing.com, LLC. Dewey, Dewey Decimal Classification, DDC, and OCLC are registered trademarks of OCLC.