Started with two phone screens before an on-site interview. On-site interview was 4 rounds on 1:1 or 2:1 (in the case there was a shadowing interviewer) and includes lunch. On-site interview travel arrangements and reimbursements were handled by a contracted travel agency acting on behalf of Facebook. All my interviewers were very nice and professional. You will be hard pressed to find engineers with big egos here. The recruiters I worked with, on the other hand, mostly seemed like they had their act together. I thought my interviews went well – each of my on-site interviewers complimented me on my solutions, so I was surprised when my recruiter emailed me that I did not get an offer. Something fishy is definitely going on at Facebook. I am under the impression that their HR department is not completely honest with their candidates. If you sort the interviews by date on Glassdoor, you will notice that no one recently has been getting offers. I've been told by friends (inside and outside the company) that they thought Facebook wasn't even hiring anymore until the Fall... So I was definitely surprised when I was approached with the opportunity to interview with Facebook. I am at a loss of words after receiving my rejection despite the positive feedback my interviewers provided me. This experience has definitely deterred me from considering Facebook for future employment as it feels like I was brought through the process just so HR could justify their recruiting budget despite there being no job.