Well that's great, but it's also stupid. Companies like Google and Facebook have hundreds of high-level engineers staring at all levels of their system all day long, trying to find out where their microseconds have gone. And these people are responsible for umpteen billions of dollars in capital expenditures every year, and responsible for capacity planning and so forth. The theory espoused at the link you posted requires that all of these people are either not smart enough to notice that an external entity is using their resources, or that these people, who I would point out are largely not Americans, are in on the conspiracy, or, finally, that the NSA is capable of pulling off their surveillance without having any detectable impact on production CPU, memory, storage, and networking.

These are highly implausible scenarios.