Facebook received between 9,000 and 10,000 requests for user data from the US government in the second half of 2012.
According to the social networking site the requests related to issues of local crime all the way through to national security.
Microsoft received between 6,000 and 7,000 requests. The developments come after former CIA employee Edward Snowden leaked details of a US electronic surveillance programme.
Microsoft, Facebook, Google, Yahoo and Apple were reported to have given the National Security Agency (NSA) access to their servers.
The firms dismissed the claims, but added that they did comply with lawful requests.
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