I have gotten as far as doing the onsite multiple times in the last few years. I won't go into the details of the process, as they've been described by other folks, but there's one element I definitely want to point out, which to me is of the utmost importance.

After they let me know I failed the n-th onsite, I asked for feedback, and I didn't receive any specific one. This is not new to me, as this never changed time after time.

I'd like to point out I interviewed with other companies in the Bay Area before, and there is indeed such a thing as very detailed feedback, which is very valuable information to a candidate!

This is not the end of it, though.

After some time, I got an email with a link to a thorough feedback questionnaire about the last interview process at Facebook.

Since I believe in symmetry, needless to say, no contribution whatsoever will be given!

This is the reason for my negative assessment.

NDA