There's more to come. I've interviewed with Facebook for a similar position.

After a phone screen, they setup another call that was probably more intense. They asked me to be near a computer with a net connection so I assumed I'd be writing code or troubleshooting something.

I ended up turning it down because I received an offer from another .com that seemed more promising but I believe if I passed the next call, I would have been flown in.

Oh I see, so probably just an interview to filter out candidates.

This is standard issue phone screen sort of stuff. You could have a technical recruiter do this, which is what I would assume happened here.