WASHINGTON: Internet giants Facebook and Microsoft say they received thousands of requests for information from US authorities last year but are prohibited from disclosing how many related to national security.
The two companies have come under heightened scrutiny since word leaked of a vast secret Internet surveillance program US authorities insist targets only foreign terror suspects and is needed to prevent attacks.
Facebook said Friday it had received between 9,000 and 10,000 requests for user data affecting 18,000 to 19,000 accounts during the second half of last year and Microsoft said it had received 6,000 to 7,000 requests affecting 31,000 to 32,000 accounts during the same period.
But those requests include criminal warrants, subpoenas and other orders, and both firms said they were prohibited by law from listing a separate tally for security-related requests or secret court orders related to terror probes.
"We continue to believe that what we are permitted to publish continues to fall short of what is needed to help the community understand and debate these issues," Microsoft's Deputy General Counsel John Frank said Friday.
He added that the orders which had to be disclosed in increments of 1,000 only affect a "tiny fraction of Microsoft's global customer base".
Facebook's general counsel Ted Ullyot insisted the popular social network with over a billion members had "aggressively" protected users' privacy and had not complied with all the requests.
"We frequently reject such requests outright, or require the government to substantially scale down its requests, or simply give the government much less data than it has requested. And we respond only as required by law," he said.
Google, which already publishes a "Transparency Report" on such requests, has meanwhile asked the FBI and US Justice Department for permission to release separate tallies related to security probes, saying it has "nothing to hide".
Major Internet firms have faced a public backlash since government contractor Edward Snowden leaked details of PRISM, a vast program in which nine companies turned over user data to the US National Security Agency.
Leaked details of the program -- first published by Britain's Guardian newspaper and the Washington Post -- have reignited debate over the trade-offs between privacy and security a decade after the September 11 attacks.
The companies, which also include Apple and Yahoo, have denied claims the NSA could directly access their servers. US authorities have said the program was legal and limited, and helped prevent terror attacks.
FBI Director Robert Mueller told lawmakers this week that the program could have prevented the September 11, 2001 terror attacks and said the leaks had caused "significant harm to our nation and to our safety".
He also confirmed that Snowden was the subject of a criminal investigation.
Snowden, a 29-year-old IT technician, has meanwhile gone to ground in Hong Kong, where he had surfaced for media interviews after the leaks were published. He has vowed to contest any extradition order in court.
Hundreds of protesters staged a rally in rain-hit Hong Kong Saturday to urge the city's government not to extradite Snowden and to criticize the US surveillance programs.
Snowden told the South China Morning Post newspaper earlier this week that there have been more than 61,000 NSA hacking operations globally, including targets in mainland China and Hong Kong.
The United States has yet to file a formal extradition request to Hong Kong, a former British colony that retained its separate legal system when it returned to Chinese rule in 1997.
Beijing ultimately retains control over defense and foreign affairs but it and Hong Kong's governments have yet to make any comment about Snowden's case.
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