They have also set up an online petition for members of the public to show their support. The letter was also signed by a number of non-profit organisations and trade associations including Human Rights Watch, Electronic Frontier Foundation and Wikimedia Foundation.
The corporations said publishing user data on request should be treated in the same way as other investigations, and insisted that the government take responsibility for the respect of civil liberties.
The letter listed key information that it argued companies should be allowed to publish:
- "The number of government requests for information about their users made under specific legal authorities.
- The number of individuals, accounts, or devices for which information was requested under each authority.
- The number of requests under each authority that sought communications content, basic subscriber information, and/or other information."
The companies said that in order to allow the technology industry to continue to prosper, the suggested steps had to be taken.
"Just as the United States has long been an innovator when it comes to the internet and products and services that rely upon the internet, so too should it be an innovator when it comes to creating mechanisms to ensure that government is transparent, accountable, and respectful of civil liberties and human rights," the letter said.
On Tuesday, Yahoo won the right to reveal data requests after a court battle, with Microsoft pushing for further transparency with an in-depth blog post on its stance. Microsoft has been hit especially hard by the PRISM surveillance allegations leaked by NSA whistleblower Edward Snowden, with repeated claims of "blanket access" to Microsoft services having to be denied by the company.