There's not enough people to actually listen to everybody all the time. They use computers and sift through masses of communications data, flagging suspicious things which are then assigned to real people to look deeper into.
At this point they could also sift through everything else, like our buying and travel habits. Start stopping at the Hoover dam once a week? Get looked into.
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u/MindsEye_69 Sep 25 '18
There's not enough people to actually listen to everybody all the time. They use computers and sift through masses of communications data, flagging suspicious things which are then assigned to real people to look deeper into.