I took the phone interview at FB, which included two Leetcode problems (easy/medium) level, with big(O) follow up. No resume went through or other stuff, only the algorithm problems were asked. Overall it felt good, the interviewer gave hints when I stuck.

7 Interviews, didn't receive an offer after the final round. Time-consuming process, which includes multiple rounds of technical interviews (design, coding, behavior, etc.) and a 1-hour research talk. The team leader was unpleasant to interact with.