How does facebook decide who to suggest you befriend?

[Noeatinginthelibrary]

You know the "people you may know" section?

It's on your homepage [idk about the mobile site but def the desktop version.]

It chooses one or two [sometimes just one--why just one sometimes??] people with whom you have friends in common.

Well ppl I went to high school with, I have like literally 50 friends in common with...but facebook never suggests those people to me. It always suggests people I have like 4 friends in common with??

Also, almost everyday it suggests my crush, which I think is really weird and coincidental. Because I only have 4 friends in common w/ him.

Is is likely that if it keeps suggesting him to me..that he also sees my profile when he logs on? Like does it work both ways? Would facebook suggest us to each other or how does that work?

Thx