[w0mbat]

Facebook wasted loads of my time before I even got onsite, with several shared-screen coding phone interviews spread over a month. Each time I would solve all the problems and get to working code but a week later they would ask me to do another interview.

I got reasons like "the interviewer quit without submitting his feedback" or "interviewer said he had hard time understanding your voice on the phone" (I'm a native english speaker and interviewer was not), or "interviewer lost his notes", etc. Maybe my code just sucks and they were lying but I don't think so. It took so long to get through that stage to the onsite that I felt like I'd already worked there.