I was contacted by a recruiter through LinkedIn. I was asked about what I was doing in general in my company. Then the recruiter talked about what what features they were developing at Facebook, asked me if I was interested in an iOS developer position, and a phone interview was scheduled about a month later. On the interview day, an iOS engineer called at the scheduled time. He first asked me how memory was managed in iOS. After that, he gave 2 coding problems to work.