I was watching Operation Crossfire aftermath and another use for Slack came to mind. Lindybeige was coordinating a miniatures wargame with several dozen people, across the world, over a 4 hour period using email. It was a logistical nightmare trying to keep track of each conversion and the materials needed to be gotten and sent to each participant -- half of whom were called "Steve"! As I watched it occurred to me that had Lindybeige instead used Slack and created, for example, a channel for each participant and a channel or two for general purpose it would have been logistically much easier. Channels in bold have unread messages, messages are organized chronologically, messages could include maps or command and control documents, messages can be pinned for easier reference, etc. Lindybeige still would have been exhausted by the effort, but, hopefully, in good spirits throughout.
I should note that using Slack in this way is not the same as using a messaging platform such as Skype, IRC, etc. In a messaging platform you are talking with an individual within the context of the rest of their life's conversions. Instead, a Slack workspace is being using to gather individuals for a shared purpose. The rest of their life happens outside of the workspace. When the individual is in the workspace they are, for all intents and purposes, the character they are playing. This is reinforce by their communicating via the named channel. I am no long Andrew Gilmartin, but instead I am #Second Lieutenant Anderson.
 This is a follow up to Slack for One.
 I know next to nothing about who is Lindybeige. I do enjoy his YouTube channel.