Typically, complete 2-3 LeetCode questions in 45 minutes, including edge cases and working code. It's based on luck if you get questions you've already prepared. Just go through top Facebook questions and hope they ask you from that list.
LeetCode Medium Top FB Questions
The following metrics were computed from 51 interview experiences for the Meta Software Development Engineer role in United States.
Meta's interview process for their Software Development Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Software Development Engineer interview process in United States.