Meta Software Developer interview questions

I was referred by my friend. I interviewed at Facebook in Oct 2016. The question is not difficult but I did not give an optimal answer in the first place. Rather starting to code right after the question was given, I spent some time to explain how would my idea work and simulate the process. I thought more communication would be more important than just coding, but it turnt out not. I would suggest no or little communication with a coding show for the interview.

Had a phone interview that lasted about 45 mins. Basically just coding problems not much behavioral questions. The interviewer was very helpful. They usually ask 1-2 questions. I thought I did fine but I think there were just better candidates. I never got to the 2nd problem though.