LibraryThing is a social networking site that provides an online way to keep track of you home library. They allow you to enter your own library and find others with similar tastes. They also compare and catalog your items and fill in most catalog data by only entering an ISBN number. You can also read reviews and enter them yourself.
The primary feature of LibraryThing is the cataloging of books by importing data from libraries and from Amazon.com stores. Library sources supply MARC and Dublin Core records. Users can import information from 690 libraries, including the Library of Congress, National Library of Australia, the Canadian National Catalogue, the British Library, and Yale University. Data can also be entered by hand.