Took about two months, from when my resume was submitted by a Facebook employee through when a decision was made.
I had a phone screen with the recruiter. That went well enough for next step.
Scheduled for a phone screen with the person whose job I’d be sharing. I asked to have it in person, and FB arranged it. That was a mix of technical and behavioral questions. That went well enough for next step.
Facebook recruiting sent me the list of people I’d meet, what type of interview it would be, and a lengthy list of resources for preparing for the interview.
In person interviews with 6 people, with some technical, some design, and some behavioral questions about dealing with teams.
Several weeks later I was told they were going with another candidate.