Today, Yahoo joined Facebook, Microsoft and Apple in publishing the total number of requests it received from the U.S. government to examine its data. In a post published on the company's official Tumblr blog, Yahoo revealed that over the past six months it received between 12,000 to 13,000 requests from the feds. Like other tech companies before it, Yahoo had to lump requests from FISA and ordinary requests together due to White House requirements.

Yahoo CEO Marissa Mayer also used the opportunity to push the U.S. government to change the laws that prohibit companies from revealing exactly how many FISA requests they receive.

"Like all companies, Yahoo! cannot lawfully break out FISA request numbers at this time because those numbers are classified; however, we strongly urge the federal government to reconsider its stance on this issue," wrote Mayer with the company's general counsel Ron Bell.

Mayer also promised to release its "first global law enforcement transparency report" over the summer. The document will cover the first half of 2013 and will be updated with new statistics twice per year.

Yahoo is now the fourth tech company to release data request figures out of a total of nine implicated in the PRISM leak. Meanwhile, Google and Twitter have declined to publish similar figures, arguing that the Obama administration's policy of combining requests concerning national and local security render the data useless.