First spoke with hiring recruiter, to determine if I was interested. Second interview was by a video conference with a researcher, where I talked about my experience and was given hypothetical research scenarios and how would I address them. Third interview was a visit to the Facebook campus, where I had a panel presentation/interview followed by four individual interviews.

Phone screen followed by virtual interview with hiring manager followed by full loop (several interviews on a single day). The recruiter was very helpful in targeting the right role. The hiring manager was quite rude and asked bad questions that could not really have helped assess qualifications for position.