this will at least help with dynamic groups

get curse. if everyone could get curse, you can communicate with your fellow teammates, and its not invasive of your privacy. https://www.curse.com/ You dont need to give your information out, like in skype. you can make/join temporary chat rooms,that are instant and easy to use. you hit create a room, and in the room it gives you a 4 character code. you give that code to other players and they can join the room as well. your next room you have will use a new code, so you dont have to worry about players from other games trolling you and joining your room from nowhere. There is a ingame hud that only shows up if you hold tab, so its not invasive of your game experience, and allows you to mute players from there, if there are rages/abusive players. curse helps so much in your games, and i recommend to everyone you use it.