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The biggest difference is that if you shoved a million active users in a single chatroom back then it would have crashed all of AOL. The same problem can have vastly different solutions at different scales.


Huh? Where have you ever seen a Slack channel with a million active users?


100K – https://slack.com/blog/news/top-u-s-retailer-h-e-b-rolled-ou...

350K – https://www.theverge.com/2020/6/4/21280829/slack-amazon-aws-...

The Kubernetes Slack has close to 200K users right now.

Amazon has 1.5 million employees, and I'm sure the majority are on Slack.

Forget 1995, no service other than Slack can run group chats at this scale even today.


> I’m sure the majority are on Slack

80% of Amazon’s employees are warehouse and drivers.


Which still leaves >300K corporate employees.




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