Facebook received 9,000-10,000 requests for user data from US government entities in the second half of 2012.
The social-networking site said the requests, relating to between 18,000 and 19,000 accounts, covered issues from local crime to national security.
Microsoft meanwhile said it received 6,000 and 7,000 requests for data from between 31,000 and 32,000 accounts.
Learn how to keep more of your own money with a free guide from CurrencyFair and over the next few days find out how I have saved using their service as well as other tips and advice. Find out more here.