I agree. D & D was my social circle when I was a teen. Most of my friends that I met was because of this game. For those who have the Faith, these social connections should be made at Church and not rely on RPG's of course. But for those who haven't heard the Gospel, I think that playing moderatly to RPG can be a good starter to build social skills.
It is not cure, only a primer in social skills towards something else in my opinion.