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Slack isn't even close to email. "Worldwide email use continues to grow at a healthy pace. In 2015, the number of worldwide email users will be nearly 2.6 billion. By the end of 2019, the number of worldwide email users will increase to over 2.9 billion"[1]. Slack has a bit under 3 million DAU [2].

[1] http://www.radicati.com/wp/wp-content/uploads/2015/02/Email-... [2] http://techcrunch.com/2016/04/01/rocketship-emoji/

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Right. I agree that Slack is nowhere close to overtaking email in absolute terms. But I suspect it is growing faster than email. Your figures project email users growing by 11.5% over the next four years. Slack is growing by that rate every quarter (at least).

Sure. Think it'll maintain that pace for more than a couple years? Especially given the strange interest in chat bots that people seem to also have.

I am honestly so perplexed by the bot mania.

Don't get me wrong, they have their uses, but how is this suddenly perceived as a multi-billion dollar market?

Indeed, it is baffling. Am glad someone else is also confused.

Not hard to grow fast when you're starting small. If I launched a new chat service later tonight, it'd be the fastest-growing communication technology in the world tomorrow, since it'd be going from one to two or three or possibly even four users. Slack would kill for a 300% daily growth rate!

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