There must be something missing from the instructions in this plugin, as I've tried it countless times and I never managed to use it. The godot debug shows this error:
W 0:00:02.460 call: Facebook plugin not found!
<C++ Source> modules/gdscript/gdscript_functions.cpp:817 @ call()
<Stack Trace> facebook.gd:36 @ _ready()
How to install this Facebook plugin?