Can someone get into your Facebook account without using a device? I see that I was logged in but the only device in settings is my iPhone?

Can someone get into your Facebook account without using a device? I see that I was logged in but the only device in settings is my iPhone?

Then you were logged in on your iPhone.

But I was never physically logged on at all

Of course they can Facebook is a Website so they can get into your Account using a Computer

They would need some sort of device that access the internet & has either the app or a browser to access the site & then of course your credentials.