django-social-auth with custom user model and overridden save() method

django-social-auth with custom user model and overridden save() method

I'm using django-social-auth, and I'm really impressed by its simplicity,
however I use a custom user model and I overrided the save() method in
order to set a default computed value for a field I need, the problem is
that save() is not called by socialauth! How can this be possible? Is
there another way of setting a computed field value at creation-time?