• Tech giants turn over data from tens of thousands of accounts
• Limited disclosure part of transparency deal made last month

Microsoft, Twitter, Google and Facebook all want to give greater disclosure of Fisa requests
Microsoft, Twitter, Google and Facebook all participate in the NSA’s Prism effort. Photograph: Pichi Chuang/Reuters

Tens of thousands of accounts associated with customers of Microsoft, Google, Facebook and Yahoo have their data turned over to US government authorities every six months as the result of secret court orders, the tech giants disclosed for the first time on Monday.

As part of a transparency deal reached last week with the Justice Department, four of the tech firms that participate in the National Security Agency’s Prism effort, which collects largely overseas internet communications, released more information about the volume of data the US demands they provide than they have ever previously been permitted to disclose.

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