Meta Intern interview questions

One 45-min interview with a Facebook engineer about algorithms. Plus there was a tour and Q&A panel about the internship at Facebook. The whole onsite interview started at 11am and ended at 4pm,

Applied online, was surprised to hear back a few months later. I was asked about my projects and then asked a technical question that at the time, I had no idea how to solve. The interviewer was very nice and she helped me through it. I did not recieve an offer but only because I did not know what I was doing at the time and did not know how to solve technical problems.