Google publishes national security letters for the first time

Google is providing for the first time a look into the world of national security letters -- demands from the Federal Bureau of Investigation to hand over details about account holders and keep quiet about it.The letters are a part of business for Google and other major internet companies, but  traditionally they have been barred from acknowledging the letters' existence. That changed in 2013 when, in light of revelations about Internet surveillance by U.S. intelligence agencies, Google and