The most innovative technology to have come out of chat programs is Slack&#x27;s feature that let&#x27;s you EDIT chats in real time, and leave reactions.<p>This is such a crazy innovation to the structure of chat programs, that it blows my mind other real time communication platforms haven&#x27;t incorporated it.  Even Facebook Messenger and GChat feel inadequate now that I&#x27;m consciously aware that they don&#x27;t let me edit my chat messages after sending them.  It&#x27;s such a no brainer innovation that nobody has ever done, likely because when you&#x27;re building a chat program the idea of letting people edit chats after they send them makes the brain of any engineer hurt -- but there&#x27;s an untapped value to allowing it that many products haven&#x27;t realized yet.