You chat with an entire Team(Group/Project/Department) members at once. Any Team member that is online will instantly receive your chat messages. Team members that are offline can view the team chat session later since it is reviewable later in MangoApps.
To start a Team chat, click the “Team” from left hand navigation bar in MangoApps, find your Team, and click “Team Tools” -> “Join Chat”. Social bar at the bottom will display the Team chat window.
Alternatively, You already have Teams(Groups/Project/Departments) in Social bar. Select one to start a group chat.