The people at FB that I met were confused about this particular role and its purpose, function, etc. Had 5 interviews, first three went well, at the beginning of the fourth was told the job-for which I had been interviewing-had changed, and that the proceedings will focus on this "new job"-a position for which I did not apply. Questions and answers ensued around something that I would never have applied in the first place. Long story short. Got a "thanks-but-no thanks" email two weeks later from a job I did not apply. I wrote a letter to the recruiter regarding the matter, she apologized and promised to look into why FB decided to change jobs half way through the process.