Meta Software Engineer(Internship) interview questions

I got an e-mail from a recruiter and sent my updated resume. Then they contacted me asking some questions and my availability. They set up an initial phone interview. The interview was 45 minutes long. It started with a short introduction and then I was given a programming challenge. It was hard, it took me a while to figure out an algorithm that would solve the problem.

It's a phone interview. Start with a introduction of interviewer and myself, then toke about my projects. Then having a algorithm question. The last ten minutes is about asking questions of the company.