I heard they were interested in physicists so I applied online and heard from a recruiter within a week. The initial phone interview included a few technical questions but it seemed more like a "cultural fit" screening. They want enthusiasm! We set up an interview on the FB campus a week and a half later. I received an email at 12:30am the morning before my interview with "interview tips". I had no idea what I was getting into and would have needed to study for a few weeks in order to brush up on CS concepts I haven't addressed since undergrad. Went to the interview completely unprepared. As much as they advertise that they want physicists they did not ask any questions, or offer me any time, to ascertain how my experience and skill set may apply to the position. They really just wanted a code jockey. While I have coding experience, it was not sufficient for the position. This is understandable but should have been made clear in the initial screening so as not to waste either parties time. Everyone was nice but very unorganized.