LibraryThing is a social networking site and cataloging tool for readers that has recently implemented work-to-work relationships based on FRBR (Functional Requirements for Bibliographic Records). This allows users to define relationships between works such as "contains" or "parodies". LibraryThing displays these relationships through work pages and relationship manipulation tools. While most integrated library systems have not fully implemented FRBR, LibraryThing's work-to-work implementation is currently the most comprehensive and may inspire further library adoption of FRBR standards.