Citations on the fly. WorldCat previously, the world's online largest catalog of library holdings, got its own Facebook page in early 2008. That was pretty cool, but now WorldCat has upped the ante again by introducing another Facebook app called CiteMe. Using CiteMe, Facebook users can look up any item in WorldCat (there's over 1 billion of 'em) and get its properly-formatted citation (choose from APA, Chicago, Harvard, MLA, or Turabian styles) instantly. For more than a few citations, you can still build a bibliography of any size in your favorite style, directly on the WorldCat site.