Meta Software Engineer Intern interview questions

I had two technical interviews, both on the phone since I live in Europe and all of Facebook's development is done in the U.S. They talk to you on the phone while asking questions, then you code in an online text editor of which they can see the results live as well. They're very reasonable during these interviews: when you didn't quite get a question, they'll happily explain it better, if your answer is good but not quite there, they'll point you in the direction they want to hear more details about, and so on.

I had an initial informal interview with the campus recruiter who got me a technical phone interview. The technical interview was on the phone, was 45 minutes long, and consisted of two programming questions that were relatively easy. The recruiter was pretty friendly, and the interviewer was pretty cordial. I felt confident about the interview, but I was told I wasn't a good fit.