Slack is actually a technical term in product management that means the excess capacity the system has to absorb any failures or to take on new work. That's something that was really on our minds when we came up with it.

If you work at a 10,000-person company, and you're using e-mail as the primary means of communication, then you probably have access to a couple hundredths of 1 percent of all the communications happening across the company. But if you use Slack, you might have access to 10 or 20 percent.

The most productive employees, from my experience, are those who go home at 5:30 P.M. but are hyperfocused at work. People can only think really hard for six to eight hours a day.

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