I applied through college or university. The process took 2 weeks. I interviewed at Meta in Mar 2017
Interview
I got an email from Facebook with questionnaire and a link to apply online. Within 2 days got the email for phone screen interview. The interview started at the exact time scheduled. There were 2 easy/medium technical questions. Overall the interview went okay.
I applied through a recruiter. I interviewed at Meta
Interview
A university recruiter reached out on LinkedIn. I sent a resume and scheduled a phone screening. To be fair, I hadn't prepared as well as I should have, so the difficulty I had was my own fault. However, the interviewer himself was very distracted (I could hear him speaking with someone else on his end, and he was very slow to respond when I had questions). He asked me questions about something on my resume, but he phrased it just like a clarificatory question, so I answered briefly. Then he laughed at me, because I didn't go on to explain further.
I applied online. The process took 3 weeks. I interviewed at Meta (Menlo Park, CA) in Feb 2017
Interview
The first round was a phone interview which was a simple data structures question regarding queues. Then their was a second on site interview which had two relatively easy questions.