By: Amber Hildebrandt, Michael Pereira and Dave Seglins | CBC News
Canada's electronic spy agency sifts through millions of videos and documents downloaded online every day by people around the world, as part of a sweeping bid to find extremist plots and suspects, CBC News has learned.
Details of the Communications Security Establishment project dubbed "Levitation" are revealed in a document obtained by U.S. whistleblower Edward Snowden and recently released to CBC News.
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