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What is Slack? And what is it used for?

By Deb Tennen · The Zapier Blog · 10/23/2026

When I first used Slack back in 2015, I could not for the life of me wrap my head around the concept of threads. Now, after a decade or so of Slacking, I'm the person passive aggressively reminding people to please respond in threads for the love of all that is productive. That's all to say: I know…

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