These are people who are too lazy to pick up the phone and communicate with/make friends.
Player 2: Roger that.
Player 3: I think I'm gonna buy an Ipad.
Player 3: You really gotta play the new Star Trek MMO.
Player 3: Check out the links I sent you to my 97 web comics I read.
Player 1: I'm gonna f***en stab you while you sleep.
Player 2: Get outta here you Venthole!!!