how to know people view your facebook profile?

[Susan]

I don't know of any way to do that. But if there is a particular one or two people you are concerned about and hope they WON'T view it, you have several options. You could block them from your posts, even if they are your friend. They just won't see those posts, and it will look to them like you haven't had any activity. You can completely block them, and they won't even find you in a search. Or you could amp up your privacy settings so only your own facebook friends can view your page, and then don't friend them.

Not long ago I clicked on an app that claimed to tell you which 10 of your friends visits your page most often. It listed 10 of my friends, but I'm certain it was bs. Not one of the people who tend to "like" or comment on my posts made the lists, and one person was on the list that I know for a fact joined facebook, decided it wasn't interesting, and then barely ever went back on it again. Worse, that app kind of hacked me, and sent posts to a bunch of my friends that quoting me as saying "This is so cool you should do it too!!" or something like that.