They usually have one interview, and if you clear that, you have another interview. Mine were on consecutive days. Each interview was 30 minutes long. They do not spend too much time chit-chatting and usually get right to business. They focus on how you approach the question more than whether you actually got the question right or not.
The following metrics were computed from 112 interview experiences for the Meta Software Engineer Intern role in United States.
Meta's interview process for their Software Engineer 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 Engineer Intern interview process in United States.