What an odd interview. I got the sense that the interviewer was really looking for Stephenson to lash out with some juicy rant about how awful Facebook is, but he is so mild about the whole thing.
I think if you saw my full questions (had to edit for brevity) you would have gotten a different sense. I really was curious to know what he thought, given no one else had talked to him, which I found strange, but glad I did!