So, you just updated the facebook app on your iPhone or iPad and now, you cannot figure out how to log off (out)? The reason is that with the new update, the main app and messenger app have integrated themselves. However, we still have found a way to log out.
Go to "Settings", then menu "Facebook Privacy", next you have to click on the menu-bar on the top left hand side which will reveal the facebook-menu. Scroll down to the bottom and log off.
Clearly, this update is very tedious and the opposite of user-friendly