A: Portland, Maine, United States
On August 29, 2005 Tim Spalding, of Portland, Maine made LibraryThing operational. LibraryThing is a social cataloging website for storing and sharing personal and historic library catalogs and book lists.
"By its one-year anniversary in August 2006, LibraryThing had attracted more than 73,000 registered users who had cataloged 5.1 million individual books, representing nearly 1.2 million unique works; in May 2008 they reached over 400,000 users and 27 million books" (Wikipedia article on LibraryThing, accessed 12-15-2008).