The National Security Agency reportedly relies on a familiar online consumer-monitoring tool -- Web browser cookies -- for surveillance. According to documents leaked by Edward Snowden, a favorite option for the agency is said to be Google's PREF cookie, which can be used to track a user from location to location. The same report also revealed the agency uses location data gathered from smartphone applications to track users. Separately, another disclosure showed the NSA gathers 5 billion location records for cellphones around the world each day.
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