"That's pretty much the working definition of law enforcement everywhere, man. There's only 1 police officer for every, what, 10,000 citizens? It's a practical impossibility for the NSA to do all the things the tin foil hat brigade claims they're doing -- monitoring everyone's cell phones, everyone's e-mail, the entire internet... and just to keep things interesting, doing all that while cracking foreign powers' high level cryptography and military communications systems. To do everything they claim they're doing, even assuming their technology is twenty years more advanced than the civilian sector equivalents, would imply multi-trillion dollar budgets per year to sustain and a workforce vastly higher than the numbers available suggest."
This being Slashdot, I would hope that people here would take into consideration automation of the information gathering process. The ration of analysts to citizens has almost no relevance. At a reasonable bitrate, you could records every telephone conversation made in the US on just a few racks of equipment. All text-based communication storage is trivial. It is all about access to the infrastructure. That does not mean they are capable of producing actionable intelligence, but they are most definitely capable of collecting everything and running some queries against it. If the data is being queried, even if it is not included in the results, the data is being unlawfully searched.