Meta Software Developer interview questions

First round of interview happened one month ago, and was informed one week after that I was invited to a onsite interview. As usual, it starts late, at noon. One system design, two coding and one culture. The interviews are not difficult, but do need solid knowledge on database design, basic data structure and algorithms. No more than string, pointer, graph and tree.

I was contacted by a recruiter to an on-campus interview. Interview lasted about 45 min. Had to solve 1 problem and some behavioral questions (Favorite project, Why facebook, where I see myself), overall I felt I did not prepare enough, I solved the problem correctly but It took me some time to make it optimal.