Meta has a very standardized interview process that consists of two rounds of technical interviewing. I would recommend practicing with friends and grinding LeetCode questions beforehand. The interviewers are very nice and want to help you do well.
I can't even really remember.
The following metrics were computed from 65 interview experiences for the Meta Software Engineering Intern role in United States.
Meta's interview process for their Software Engineering Intern roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Meta's Software Engineering Intern interview process in United States.