Meta Software Developer interview questions

Had an HR phone call that was mostly basic questions about previous experience, and why I feel I would be a good fit at Facebook. At the end of the call, we set up an on-site technical interview. Had to postpone it a while, but they were very helpful with rescheduling whenever was convenient for me. The technical interview went well, getting a tour of the facility before sitting down with an engineer. The interview lasted around an hour. I was asked a question about checking for palindromes, and a question about graph traversal. Ran into some trouble with the graph traversal, which I eventually described to the interviewer correctly, but didn't have enough time to write it on the whiteboard. I think that's the reason I was told to get more experience and reapply in a few months.

one telephonic interview and then onsite interview. 4 interviews during onsite interviews.