It's usually a good idea to add friends in this game to quickly find a group to join or invite replacement if a slot opens up in your party. However with a large friend list it gets difficult to keep track of who is who when you only played once with some of those friends.

I think it would be nice to be able to form subsections in the friend list so you can better keep track of who progressed how far in the game. It would be nice if players could form their own groups but I think just breaking it down into tier 1, tier 2 and tier 3 friends would help a lot, too.