Yes, they only go up to second level of friends.
Yes. We also require you to stop using Google, uber and snapchat and do calls through messenger only from now on
I'm former FB and they definitely don't look at your past post before they hire you. It is very very strictly forbidden to look at the FB data of anyone you "know" which includes job candidates or even someone who committed a crime against you. Yes, that strictly forbidden.
You have to follow Mark and like all his posts.