I was originally contacted by a recruiter after I submitted my application through a University Grad portal.

• 45-minute on-campus interview with a technical question and some general fit questions.
• Flew out to their Seattle office for University Day. There were three 45-minute interviews: one behavioral interview (Jedi) and two coding interviews (Ninja). The coding interviews covered fundamental concepts in data structures and algorithms. I signed an NDA, so I can't tell you about specific questions, but you don't need to review very specialized information. Just make sure you know the basic data structures/algorithms and how to apply them.
• A week later, I received an offer and accepted.

The Facebook recruiters are by far the most helpful and efficient recruiters that I've ever worked with. Most e-mails are responded to within a few hours and made me feel very comfortable throughout the process.