As I haven't used search I don't know if there's any topic like this already, but I want to suggest it anyways. Many games contain clans or something a like, the advantage of this is that you basically have a group of friends who you fight with and share your thoughts with. This will be done by having your own private forum. But what's the use of these clans? Well it's nice to have some 'score system' to it consisting out of Clan Battles.
Clan Size
A good amount of people in one clan should be 10, this would create a nice amount of clans to storm into the top lists.
Clan Battles
A Clan Battle can be organized between two clans. For example Clan 1 dares Clan 2 to battle a Triples game on a Classic map. You pick 3 people who will fight in this battle, and to prevent it that one player plays each game you can only fight 2 simultaneous Clan Battles. The points awarded for the win (as normal players) will also be awarded to the clan's total, so only points in Clan Battles count. Also you can have 3 Clans involved in a doubles game for example. Clan Battles can only be in Teams of course.
This would add a new feature to the game, a new scoring list, more competition between people and a nice way to get to know each other.