code: public boolean pages_isAppAdded(Long pageId)
      throws FacebookException, IOException {
      return extractBoolean(this.callMethod(FacebookMethod.PAGES_IS_APP_ADDED,
                                            new Pair<String,CharSequence>("page_id", pageId.toString())));
    }
docs: Checks whether a page has added the application
  @param pageId the ID of the page
  @return true if the page has added the application
  @see <a href="http://wiki.developers.facebook.com/index.php/Pages.isAppAdded">
  Developers Wiki: Pages.isAppAdded</a>