Messages are generally emails sent to you by an Application. Applications often will send you messages when one of your Connections invites you to try out an Application or when (for example) it is your turn in a game. For instance, an App called "Movie Guesser" could send a message on your Connection's behalf saying "Steven S challenges you to a Western Trivia Challenge in Movie Guesser" after Steven begins a trivia game inside that Application. To protect you and your friends' privacy, all potential messages must be confirmed by the user before they can be sent.