The letter follows this summer's revelations by former National Security Agency contractor Edward Snowden, who leaked details of the secret programs that critics argue violate privacy rights. Intelligence officials argue that the NSA's tactics have helped to disrupt terror attacks and that they've taken care not to routinely look at the content of conversations or messages by American citizens.
But the technology companies argue that officials should codify "sensible limitations on their ability to compel service providers to disclose user data" and to ensure that law enforcement and intelligence efforts should be transparent and accountable. It makes an appeal for respecting the free flow of information across borders, describing it as "essential to a robust 21st century global economy."
Though the campaign was directed internationally, a letter on its website and published in U.S. newspapers struck particularly at the United States government, whose exploitation of Silicon Valley firms has attracted particular scrutiny. CEOs and senior leaders of the companies weighed in, making it clear they were personally behind reform.
"Reports about government surveillance have shown there is a real need for greater disclosure and new limits on how governments collect information," said Mark Zuckerberg, the CEO of Facebook. "The U.S. government should take this opportunity to lead this reform effort and make things right."
Marissa Meyer, the chief executive at Yahoo, said the disclosures had "shaken the trust of our users."
The letter was signed by AOL Inc., Apple Inc., Facebook Inc., Google Inc., LinkedIn Corp., Microsoft Corp., Twitter Inc. and Yahoo! Inc.
Obama has asked a panel of hand-picked advisers to report on the issue this month and recently said he'll propose the NSA use "some self-restraint" in handling data. He maintains, however, that the NSA isn't interested in reading people's emails and text messages.
The technology companies have good reason to band together to pressure the government to set limits — the free flow of information is fundamental to their business models. Information on consumers is critical to the advertisers that want to reach them. But consumers need to be able to trust that their privacy concerns are safeguarded, said Joss Wright, a research fellow of the Oxford Internet Institute.
The technology companies are also concerned that governments outside the U.S., such as the European Union, might set tougher rules for businesses to protect the privacy of their citizens, Wright says.
"It's potentially huge," Wright said. "Other countries around the world could make it harder for (the companies) to carry on with unrestricted data gluttony."
That data is not just from browsing the web or cellphones — the latest reports showed U.S. and British intelligence officers have even been spying on gamers by trawling data from popular online games such as World of Warcraft.
Privacy International, a U.K.-based charity, praised the industry effort and described it as a reminder that there are gross violations of the right to privacy as governments access and share bulk metadata records.
Others, however, noted Silicon Valley's stance probably had more to do with profit than principle.
"It sure would have been nice if the tech companies had been loudly supporting intelligence reform before Snowden's disclosures," said Chris Soghoian, a senior analyst with the American Civil Liberties Union.