*EDIT: Answers have been revealed (IN CAPS).
LibraryThing is an online service to help people catalog their books, while connecting them to a community of like-minded book lovers. LibraryThing (known by users as LT) is a great resource for new book suggestions, bookish news, or learning about literature. Similar to Goodreads, LT functions as a virtual library, and connects you to the libraries of others. (Find our Goodreads profile here; Our LibraryThing profile here.)
LibraryThing offers powerful tools for cataloging and tracking your books, music, AND movies. LT has access to the Library of Congress, six national Amazon sites, and more than 1,000 libraries worldwide — making LT a highly extensive database. Users can search, sort, and “tag” books, or use various classification systems (including the Library of Congress, Dewey Decimal, or other custom systems) to organize their collections. LibraryThing is also a great social networking space, allowing users to see other peoples’ libraries, including libraries similar to yours, making it easy to swap reading suggestions and make recommendations. Users are encourages to sign up to win free books through our Early Reviewers and Member Giveaways programs.