Meta Software Engineering interview questions

I'd applied through facebook website university recruiting. I got an email from their recruiter within 2 days and I set up the telephone interview in two weeks. The interview was supposed to be a technical interview in collabedit. The interview started of with basic behavioral questions. What is the most exciting thing you have done till now? My speaking skills are very sub par, so I fumbled a lot while answering behavioral questions. Then I was asked to suggest an Algorithm to print the nodes of a binary tree in their vertical order.That is the a / \ b c / \ d e / \ f g Then output is b f a d c g e I solved the question without much of the interviewer's help in under 5 minutes. Then I was asked to code this in collabedit, which I almost did, except for some small issues in has map. Then the interview ended. I was pretty confident of getting selected for this round. But I was told via email by my recruiter that they coudl not move forward with my application.(heartbreak) Till today, I refresh in my inbox hoplessly waiting for an email that there was some error :'(

I'm talking about the on-site interview. The process began with a checkin and confirmation. Then there was a 40 minutes technical interview. It was not that hard but I didn't make it. After that, we enjoyed the lunch with the recruiter at the dining hall and it ends with an amazing tour in the FB campus.