Simple, brief messages disclosing how you are feeling, where you are, compliments for each other, and how you miss each other can go a long way. (coloradocouplesretreats.com)
«I took a picture of this funny oversight with the ingame camera and shared it on twitter... cut to tonight where I can't access any services while playing the game and then when I tried to sign in there was a very brief message about my account being suspended.» (playiplay.com)
Like voicemail, it is useful for leaving brief messages, confirming meeting appointments or cancellations, or letting someone know that you're unavailable for a while. (lawyerist.com)