The company said the disclosure comes after extensive negotiations with US national security authorities, who would not allow the company to specify which requests were made by the National Security Agency.
Reuters reported Facebook was among a select number of Internet companies that were able to release "limited information" about the number of surveillance requests they have received.
Ted Ullyot, Facebook general counsel, explained on Facebook's blog that the company has been in discussions with US national security authorities since the story of NSA's surveillance program PRISM first broke. And that the requests came from various parts of the government, including local, state, and federal authorities:
These requests run the gamut – from things like a local sheriff trying to find a missing child, to a federal marshal tracking a fugitive, to a police department investigating an assault, to a national security official investigating a terrorist threat.
For that six month period, Ullyot said that data was pulled from 18,000-19,000 Facebook users accounts.