It's harder (but not impossible) to have complete service lossage like this in a federated protocol.<p>That's why you didn't hear about the great email collapse of 2006.
Slack is down, productivity goes up... after using it for a while I find it does communications within a team well but does almost nothing to increase collaboration, so I guess slack is in area which apps like Discord will disrupt.
<a href="https://status.slack.com/2017-03/c0923f37c54988ec" rel="nofollow">https://status.slack.com/2017-03/c0923f37c54988ec</a> - basically just said that there was a broken code change which they reverted.