Mobile facebook/google authorizations

Ok, to answer my own question. It does work. You need to pass state param back and forth, remember about slash at the end of redirect URI and possibly update the df-oauth and or laravel-socialite packages with composer to avoid problems with FB GRaph v2.2 being pulled out recently.
I managed to make it to work with a native iOS app so if anyone has questions, ask me while I remember what's going on.