How to Know If Your Facebook is Logged In On Someone Else's Phone

To know this, first open Facebook on your phone.

After this, go to the profile icon on the corner.

Now click on Setting and Privacy.

After this, go to Settings.

Now you have to click on Account Center.

Here you have to go to Password and Security.

After this, you will see the option of Where You're Logged In.

By clicking on this, you will be able to know where your Facebook is logged in.