Making friends and getting along with a group of people is probably the best way to go. Take a look at some of the most organized groups of the game: they all know each other (maybe they never met outside the game but you know what i mean), how they play, how they think, how they react, their opinions and so on, and that´s faster than the general chat, faster than a party, faster than ts, they don´t even need to talk to each other (apart from short stuff like "to your left!" or tactical info on locations of enemy and allied forces) because
they know what each of them will do given a particular situation, and
that is the key to this... social based game.