One of the biggest problems I have as an extrovert is getting my introverted friends introduced to other people. One thing that would help is this: Open friends list, click on your friend and click a button that says something like "Tag Mutual Friends". From that point on, I'd know who me and that friend mutually know, but then I can easily deduce who they DON'T know and then introduce them. I think this would help tremendously to support networking in game.