AMERICAN efforts last month to issue a travel ban on 12 Iranians suspected of supporting that nation's nuclear program wasn't big news at first. Shortly after, it was revealed the analysis supporting the ban was provided not by the CIA but by a single junior analyst using Google searches. The lesson? Advanced technology and Web-savvy citizenry now make it possible for open-source information gathering to rival, if not surpass, the clandestine intelligence produced by government agencies. Indeed, open-source methods have already proved their worth in counter-terrorism. Shortly after September 11, 2001, Valdis Krebs, a security expert, re-created the structure and...