If we had the option to invite to private chat in the same menu that you invite players to fireteam the social part of the game would be a lot better. The private chat could suspend fireteam or party chat until you exit private chat. We would need an option to ignore private chat request when you did not want to deal with them. This would be a great way for a quick word to another player. You could thank someone or just ask if they have time for a strike mission.