The wording on the fourth slide described the "dates when PRISM collection began for each provider," and not, for example, "dates when each provider began PRISM collection." One by one ...

Weeks after details of the US Prism programme first leaked, some of the details of what it entails have been confirmed but others have yet to be clarified, and may not do so for years to come.

Weeks after details of the US Prism programme first leaked, some of the details of what it entails have been confirmed but others have yet to be clarified, and may not do so for years to come.

Like a triangular piece of glass, Prism takes large beams of data and helps the government find discrete, manageable strands of information. The fact that it is productive is not surprising ...

The Prism allegations suggest US intelligence agencies ... But an IP address is actually not a foolproof way to follow individuals, he adds. A user's IP address on a personal computer can change ...