Meta Data Engineer interview questions

I had a chat with a recruiter and the phone interview was scheduled. Phone interview consists of two 45 minutes technical interviews - Python/SQL. Other reviews pretty much capture questions you should prepare. Interviewers are nice and the overall experience was good. However, you will never hear back from the recruiter if you are not moving forward. I heard that there are recruiters doing that to save themselves few minutes but I expected Facebook would be different. If you don't hear after a few weeks and after few emails, stop wasting your time.