Edward Snowden is one of the bravest whistleblowers in the history of modern man. Working as a former CIA employee and NSA contractor, Snowden was privy to all the details of how the US Government was and is setting up a global mass surveillance grid which can target anyone, any time, anywhere. He called it "turnkey tyranny" and here discusses the importance of privacy to a society, and the shocking extent to which we are being monitored – and what we can do about it.