as Google, Facebook, Hotmail, Yahoo, and Twitter, unique Google advertising cookies that track browsing habits, unique encryption key fingerprints that can be traced to a specific user, and computer IDs that are sent across the Internet when a Windows computer crashes or updates. See also Global surveillance disclosures (2013–present) PRISM (surveillance program) Law Enforcement Information Exchange References Counterterrorism in the United States Crime in the United States Espionage Human rights in the United States Mass surveillance National Security Agency Privacy in the United States Privacy of telecommunications Secret government programs Surveillance scandals United States national security policy War on terror Computer surveillance American secret government programs