if someone is in "People you may know"?

[A]

does that mean they looked at your account? some people i have few mutual friends with always pop up on the "People you may know" sidebar, whereas people with 100+ mutual friends never show up.

[Charlotte]

It simply means you have mutual friends with them or that you attended the same school, uni, workplace or lived in the same area

[Timmy]

I'm pretty sure it works on mutual friends that you have, with the people you contact most, or some that go to the same school, it has a whole lot of factors, not people who looked at your account.

[Christabel Markwei]

People you may know are just friends of your friends