(Bloomberg) -- As Stewart Butterfield envisioned it, his corporate-messaging app Slack was designed to alleviate the effects of endless e-mails, text messages, and phone calls. “We’re selling a reduction in information overload,” Butterfield wrote in a memo to staff before the release of Slack in 2013.

Instead, Slack has become one more thing to check for many of the 2.7 million users of the chat service. Still, people are hungry for more digital communications, whether it's with colleagues on Slack, friends on Snapchat, or acquaintances on Facebook, Butterfield said in an onstage interview at the Bloomberg Businessweek Design Conference.

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