Ammananius normally on the ball is niave on this one, to cite Germany during the Nazi period as an example is way off mark.
During the Cold war and especially towards the end in the late 1980s 'All' British Telecom UK internal calls were monitored and speech recognition software was developed especially to pick up on certain key words, if the words were picked up, then the call was directed through Langley (USA Pentagon) and recorded, and logged.
I would assume (dangerous) that GCHQ also kept tabs on these calls.
After WW2 one of the Collosus Computers is still unaccounted for, and certainly UK used Cable and Wireless another large UK Telcoms company to monitor overseas 'Traffic' and had done so since at least the 1930s to my (very limited) knowldege.
It is not that this information is being tracked and logged, it is whether the controls needed for free speech and freedom of Democracy are in place.
That Nazi Germany read peoples mail is largely irrelevant (the USA certainly didn't, Henry Stimson during Hoover's administration famously said 'Gentlemen do not read each other's mail', fortunately the British didn't see it that way, and certainly read and intercepted anyone's mail they suspected of Espionage) it is how it is used and to whom the people using it, are responsible and answerable to, and whether they work within the spirit, if not the actual word of the Law.
Snowden is a rather Niave nit wit who thinks he is being a hero of free speech, he is nothing of the kind, just someone who is misguided enough to think Henry Stimson was correct.
Snowden certainly lacks political intellect, he is being used by all sides.