What they [the US government] did do was collect the records of your phone calls, and to an analyst... that's more valuable than the transcripts of your phone calls. We care less about what you said on the phone than who you called, when you called them, what else you were doing, what your phone was doing, the websites that you had access to, the cell phone towers you were connected to—all of those things. That metadata creates what's called the social graph—your pattern of life.