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The ~600 person distributed company I work for doesn't use phone or email and obviously doesn't do anything face to face. We relied on IRC for years before switching to Slack so yes, all of our real-time communication is via Slack. We have internal blogs for threaded important async discussion though, but Slack is where our high bandwidth talk done.

How come you don't use Rocket.Chat or Mattermost or Matrix?

no care for privacy I guess.

Might it be because Slack is free and hosted for you?

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