Matt Simmons at Standalone Sysadmin writes:
What PRISM does is apparently allow the National Security Agency (NSA) access to the providers’ databases (probably through an API of some kind). Strangely enough, all of the providers have been claiming not to take part while the government has spent its time claiming that PRISM is legal. That’s an uncomfortable disconnect.
But as I said, all of this is top-secret. You and I wouldn’t even know if its existence if it weren’t for Edward Snowden.
Read more at: Ed Snowden, Whistleblower, was a SysAdmin