I applied through an employee referral. The process took 3 weeks. I interviewed at Meta (New York, NY) in Jan 2015
Interview
Had three interviews including a phone call with a FB recruiter followed by two skype interviews with current designers from different locations. First interview I had with the designer was about my projects and she was not actively responding to my explanation which made it hard for me to lead the conversation. Second designer I talked with was very understanding and showed good reaction to my opinion. It was more pleasant two-way conversation, not like the previous one. I'm glad I could do face to face skype interview with the second designer for the app critique interview.
Straightforward like any big tech interview, but long and intense. Formats are pretty standardized so it just takes practice. Questions appear like it's from a bank, so if you're prepared you should be fine.
I applied through a recruiter. I interviewed at Meta
Interview
I was reached out by a recruiter. Started with the recruiter call, then portfolio presentation, then full loop (Portfolio presentation - app critique - design challenge - background). They had very strong emphasis on design craft and visual excellence. Recruiter who helped me prep was very nice and helpful.
Typical interview process consisting of multiple rounds—Pre-screen, Portfolio Presentation, Full-Loop (Presentation, App Crit, Whiteboard Challenge and Behavioral) - Felt I did really well, and I got great feedback during the rounds but ultimately received no offer.