Internet giants Facebook and Microsoft say they received thousands of requests for data from US authorities last year but are prohibited from disclosing how many related to national security.
The Microsoft logo is seen on a tablet screen. The company has said it received between 6,000 and 7,000 criminal and national security requests from US authorities in the second half of last year related to 31,000 to 32,000 customer accounts.
The two companies have come under heightened scrutiny since word leaked of a vast, covert Internet surveillance program US authorities insist targets only foreign terror suspects and has helped thwart attacks.
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