Meta Software Engineer interview questions

I had on campus interviews in the spring and then decided to interview for full time in the fall. I had three interviews - the first went very well, the second was terrible, the third was alright. The terrible interviewer asked some basic technical questions involving writing code on the board. As I thought out loud, I asked the interviewer clarification questions and then ultimately asked whether I should start writing code on the board. The interviewer either did not respond to my questions or mumbled off a few incomprehensible words. I started writing code and as soon as I stepped back from the board, the interviewer pointed out my mistake without giving me a chance to assess the code myself. He did this an another two times for the subsequent questions. Overall, the questions were not difficult at all. It seems that Facebook wants to make sure that you code frequently enough that you do not make any errors on your first hack at a problem. This seems to fit the "go fast and break things" motto. Although things didn't work out for me, I got an offer from Google, so I guess that's not a bad second choice.