Meta Developer interview questions

First, a group of Facebook employees came to my campus to conduct on campus interview. There were 2 rounds of on campus interview - you had to pass the first round in order to get to the second. After the 2 rounds, you should be notified whether or not you receive the job. However, they asked me to complete a third and final phone interview. It took several weeks to schedule, but finally I had the phone interview. In the first interviews, I was only asked coding questions. The third was more behavioral, but we ended with a coding question.