The thing that is fundamentally different about modern surveillance is how automated it can be. Governments have always been able to listen in on phone calls an

The thing that is fundamentally different about modern surveillance is how automated it can be. Governments have always been able to listen in on phone calls and physical mail, but the limitations of needing a person to actually do these things kept a check on the scope. When every phone call can go through a voice recognition system and a set of filters to detect anyone talking about Topic X, that's a very different world. The NSA can't hire half the country to spy on the other half, but they can hire a few thousand people to build a computer system to spy on everyone.