Tim Spalding created a website where “members can create library-quality catalogs of the books they own and display their collection to fellow online bookshelf browsers. He launched LibraryThing.com in August as a way to bring the organizational joys of the librarian to a wider array of book nerds. Ten months later, his concept has blossomed into a vibrant community with 47,670 registered members – some paying – and a user-created catalog that includes more than 3.6 million volumes. In theory, that makes LibraryThing the 58th largest library in the U.S.”