i'm brian stelter.f you've had trouble keeping up with all of the nsa surveillance news this summer, don't worry, you are not alone. since memorial day there have been new revelations every single week about america's pervasive phone and internet surveillance programs, all thanks to edward snowden, who provided documents to the guardian columnist glenn greenwald. the latest on saturday came from a german newspaper. the documents apparently show that the nsa hacked into systems belonging to the arab news broadcaster al jazeera. this has been the media story of the summer. so as fall approaches, does the reporter who broke the story have more rev lagtsz to come? he joins me now. glenn, thanks for being here. in these last three months, what have you personally learned from all of these disclosures? >> well, i think the main point is that the thing people most did not know is just how limitless the nsa's goals are when it comes to spying. what they're really doing is creating a spying system that literally