I applied through other source. The process took 5 days. I interviewed at X (San Francisco, CA) in Oct 2011
Interview
I met with 5 people during a day for interviews. Of these, two seemed desperate for me to agree to join Ops and "fix everything" which was disheartening. One was extremely hostile and made it clear that she didn't think I had any value to offer based on the products developed by the most recent startup.
Interview questions [1]
Question 1
"There's nothing you can do here that we can't build on our own in two weeks."
But that was just one particularly awful interviewer - a product manager, I think. There was pretty much no way I'd agree to join Twitter after that interaction.