As someone who interviewed people applying to Facebook (or Oculus anyway), the coding tests were intentionally told to be structured as one easy question (so that the candidate could build some confidence and provide some signal) and one medium/hard coding question (ie can they write more substantial solutions and solve harder problems). That’s for the traditional “CS” coding interview. The other technical part is an open ended design question (whiteboard/hand-waving diagrams/explanations with no code).