Meta Software Developer interview questions

Referred by an employee in Facebook, then I got an email from Facebook to set up an interview over phone. The email was received after around two weeks waiting, and the phone interview was 4 days later.

They came to campus an hosted open office hours. It was an overwhelmingly positive experience at that point. I dropped my resume and was later (2 weeks) contacted by a recruiter; who scheduled a 45 minute interview with a SWE. The SWE seems distracted and was almost mad at me for logging in experimenting with text editor beforehand, which threw me off. Lesson learned - everyone can have a bad day, don't expect the up beat attitude characterized by the recruiters from every interviewing SWE.