Meta Software Developer interview questions

Went to Menlo Park on their university day (super day), received only one 45-minute technical interview. The event took your entire day. There were about 40 undergrads coming from different colleges. They were all for the internship position. I solved the problem really quickly. But I cannot optimize my code as the interview expected. That was probably the reason I got rejected.

The whole process went by incredibly quickly. After applying directly to a recruiter, I completed a coding challenge through HackerRank as part of the screening process. I then received a call from the recruiter to walk me through the interview steps, which was a very kind gesture to make towards an intern. After that, there were two phone interviews, each just a week apart. Both went rather smoothly, but I was rejected by email just hours after the second interview. While no feedback was provided, and although I thought the technical portion of the interviews went well, I have a hunch that they were looking for someone with more university and extracurricular project experience, something which I lacked.