Meta Software Engineer interview questions

The phone interview was fairly straight forward and fair. The interviewer was nice and answered all of my questions. I actually had to reschedule my phone interview twice and I am grateful how they handled it. Overall the interview was simple if you are experience it CS and I simply screwed up.

Recruitment team came to the university to present the process and offer contacts. I contacted the recruiter via e-mail, and got an answer within 2 weeks. Had an initial phone screen on which the recruiter asked me questions about my background and interests on the company. The recruiter also presented the recruiting process, and scheduled me for a technical interview via Skype. The technical interview took about 45 minutes. At the beginning, the interviewer asked me about interesting projects that I have been worked on, and then went to the technical question. I can't give the question due to the NDA, but it was a basic question about strings handling. After one week I got the response that I didn't pass the interview. I asked for feedback, but the recruiter told me that it was on their policy to not give feedback to the candidates... =/