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Most people pass through some type of public space in their daily routine — sidewalks, roads, train stations. Thousands walk through Bryant Park every day. But we generally think that a detailed log of our location, and a list of the people we’re with, is private. Facial recognition, applied to the web of cameras that already exists in most cities, is a threat to that privacy.
Source: Opinion | We Built an ‘Unbelievable’ (but Legal) Facial Recognition Machine – The New York Times