We don't, they do, but it all produces so much data there is no way anyone can read or see it.
So unless you become "a person of interest" no one will ever see it.
But put one innocuous seeming word in a post or e-mail that triggers their 'key words" and they will pull up every trip to the bathroom,
A good movie to watch is "Enemy of the State" - I like Gene Hackman movies anyway.
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