There's also the distinct possibility this is all bullshit. There have been a lot of holes and misinformation on Snowden's side("They can watch your thoughts form as you type", when none of the services except for GMail send textual data at real-time, etc), and the Q&A either doubled down some of them or was trying to be misleading.
I'm still waiting for the Guardian to stop milking this and just give us the rest of the slides, the rest of their evidence. At this point, my confidence in the story is shaken enough that I want more if I'm gonna go Pitchfork in hand at the NSA with all of this.