Meta Software Developer interview questions

The process consisted of an onsite interview in Buenos Aires. It was a 30 minutes interview in which I had to answer 2 different problemas. After that they invited me to interview again in Menlo Park.

Met at career fair and talked with a recruiter. Received an email to do an onsite interview. Within a couple days of the interview I was asked to attend a Campus day (on site) and was given a couple of possible dates. FB arranged flights and hotels (really really nice hotels) for the visit. Offers were extended within a week of the interview