Was initially contacted via LinkedIn by an internal Facebook recruiter that dealt specifically with this role. I was impressed with the recruiter's technical knowledge, always a good sign, and agreed to go through the screening and start the interview process.
The process is 5 steps:
* Call with recruiter about position
* Phone screening with a few trivia questions regarding systems administration.
* Co-operative coding phone interview
* Systems phone interview
* On-Site interview
The call with the recruiter was mostly about the position description and duties, and assessing whether both sides think it's a good fit. The phone screening, also done with the recruiter, is just a few questions that anyone who has administered Linux for an organization would be able to answer off the top of their head.
The coding interview was done using a collaborative editing tool, so both parties could see what was being typed. The coding questions were not your typical abstract data manipulation questions, but rather questions that required systems knowledge, and in my case were most easily answered with shell scripts.
I didn't actually do the systems phone interview, as they considered my programming interview strong enough to simply skip this step. I'm informed this is not uncommon.
The on-site interview loop included five 45-minute segments: Programming, Systems, Networking, Solution Architecture, and meeting with the Manager (not in that order). Additionally, lunch with the initial recruiter and a brief chat afterwards with a different recruiter that dealt with the financial and logistics portions of the interview and negotiations.
One thing that struck me during the entire process is that *everyone* I spoke to, and I mean *everyone* because I asked them all, absolutely loved working there. Every time I asked someone how they liked working at Facebook, their face lit up and they started listing off reasons they loved working there, and everyone had the same reason: They liked everyone around them, felt trusted and respected, and trusted and respected the people around them. This was unanimously the first reason, usually followed by "and the work is really interesting".