*This is deadly serious. If you're a British spook like James Bond of Universal Import-Export and somebody Google's your cover identity, how long do you last? "About a minute."
http://www.wired.co.uk/magazine/archive/2016/05/features/spies-data-mi6-cia-gordon-corera
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"In February 2003, a CIA team was sent to Milan to conduct an "extraordinary rendition" of a suspected radical Islamist: Abu Omar was plucked off the streets and transported to Egypt. Three years later, an Italian prosecutor using link analysis of phones, hotel reservations, car rentals and credit cards had been able to identify about two dozen members of the CIA team and prosecute them in absentia."
