Configuration of the Facebook widget can be found at
In order to use this widget, you need a Facebook Access token.
My Apps > Add a New App. Or, if you're not registered as a developer yet, choose
My Apps > Register as a Developerand accept the Facebook Platform Policy. And then choose
My Apps > Add a New App.
Alternatively, if you don't want to use this widget, open
/widgets/facebook/config/app.php and set
'active' => false.