I applied online,using the friendly Facebook career website. I received an email followed by informal phone interview.Afterwards,I got the chance for a tech interview. The first questions were a little general,tell me about yourself kind of thing.previous experience and the challenges faced. There were 2 coding problems, one based on recursion,factorial kind of thing... And afterwards ,a question on merging two sorted arrays in linear time.My approach solved the problem in quadratic time and was asked to improve it to the best I can. At first I couldn't really see how;but the interviewer was really nice.He gave me hints to start with. At first I stumbled because I could not immediately get the whole idea.I kept on saying stuff without changing the code until I said the right thing and he agreed with me afterwards. I am waiting to hear the outcome of the interview which I have hope I passed and will get the chance to work with such wonderful and humble people.I really liked the guy,so down to earth...I feel like crying right now...