Different stages of reject after Facebook onsite
My understanding is:
1. Recruiter will directly reject you if he/she sees no hope your packet is going to pass the debrief/hc.
2. If packet is mixed, a debrief among all interviewers + a director will be held, and a consensus is made to admit or reject. If packet is a clear hire/no hire, no debrief is needed. Directly reject or go to step 3.
3. If your packet passes debrief, it goes to a final exec review which determines level & compensation and rarely overturns hire/no hire decision.