There is a significant bias in the interview process and I recommend FB look into it. I failed interviews where I felt the interviewers had a predisposed mindset and were trying to validate that through their questions. Two interviews almost felt like a bullying sessions and the interviewers were boorish and openly skeptical of anything I said. I didn't graduate from the top universities or work at the top tier companies these interviewers were from but bring in significant experience that got me the interview. I was very bothering by the attitude of the interviewers and I really didn't want to work with that team.