doesn't mean that there aren't other mechanisms in place to collect a lot more data without specific requests. For example, the NSA could be collecting data where Facebook's servers connect to the Internet.
Apparently SSL encryption at all of the large internet corps is handled by dedicated front-ends - and the network between the SSL front-ends and the real guts of entities like facebook, google, etc are all in the clear. That makes for a perfect location for the NSA to drop their sniffers in, no need to compromise any SSL certs at all, no forward secrecy, etc, just wide open traffic perfect for raw harvesting.
And, of course, you have to assume that the Utah data center is going to be used to store something, and it ain't gonna be data obtained from just 20000 Facebook-related requests, because those would fit on my hard drive.
I think that bears repeating - the NSA ain't building data silos (there are others, like one in san antonio, texas) that consume as much electricity as a small city for nothing. They are collecting literally tons of data on us, its gotta be coming from somewhere.