Business networking site Linkedin is the latest firm to mount a legal challenge on the US government's ban on revealing the number of national security-related data requests it receives.
American companies are allowed to publish the total number of data requests made by the government, but cannot break the figure down to show how many were made by security services.
Linkedin claims the current law "makes no sense" and follows Yahoo in taking legal action against the government.
Linkedin's bi-annual transparency report was published this week, and shows the government made 70 requests for data over the six-month period.
However, as the company wished to show different categories of requests such as 'search warrant' and 'subpoena' it had to exclude a number of security service requests from the report.
In a letter to members, VP Erika Rottenberg said: "This prohibition, which limits our ability to provide the transparency that we think our members and the public deserve, has been the source of great disappointment and frustration to us.
"LinkedIn has long sought to increase transparency about government requests for our members' data, which has become particularly important in light of recent revelations about the extensive nature of U.S. government surveillance.
"This interest [in national security] must be weighed against transparency and accountability."
Earlier this month, Microsoft and Google began considering filing a lawsuit against the US government after discussions with the Department of Justice to allow them to reveal the number of data requests they receive broke down.
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