The Aggregate Number of NSA Requests sent to Facebook and Microsoft.

The total for Facebook: About 18,000 accounts over a six month period, or one-thousandth of one percent of user accounts.

Microsoft's total was about 31,000 accounts over the same six month period ending December 31, 2012. A Google representative told CNET this evening that the search company is working on disclosing the same type of statistics, and plans to be more detailed than Microsoft and Facebook.