I don’t know if this will be useful information to anyone, but I haven’t seen it mentioned anywhere else. On the full version of Facebook Messenger when you try to make a video call the view of yourself is rotated 90 degrees so you look sideways to the person you’re calling.
But for whatever reason, this isn’t the case with the Lite version. provided the camera is set to selfie mode then you appear the right way up (at least it does on my optimus 2 running FAW firmware downloaded from this site). That’s it. I just thought it would be worth mentioning.