KABUL, July 23, 2009 – U.S. Forces Afghanistan’s Facebook page logged its 20,000th fan today, passing the milestone a little more than two months after going public, making it the fastest-growing official military Facebook page, military officials here said. The fan page at http://www.facebook.com/usforcesafghanistan is one of the main tools used by the U.S. military in Afghanistan to disseminate news and imagery from its operations, and counter and pre-empt extremist propaganda, officials said. In June, for example, command officials posted video on the page to quickly counter terrorist claims that U.S. troops had attacked civilians in the city of Asadabad....