X IOS Engineer interview questions

Recruiter contacted me through email. She asked about my previous experiences and told me about all the different projects happening at twitter. We set up a phone interview a week later. The coding question was a bit obscure and nervousness got the best of me, so I spent around 15-20 minutes just trying to understand what the problem was asking. It wasn't until the interview was almost over that I realized that it was a question straight from the facebook practice coding lab site. The interviewer was still very patient with me. I knew I wouldn't get the second interview, but we still spoke a bit afterwards and interviewer entertained with stories of twitter life and the projects that he was working on.