Take Slack. The instant messaging and office chat app has swept across media, tech, and other service companies with the virility of a goat-yoga video since its launch in 2014. It already has more than 5 million daily active users around the word, and has found a home at IBM, NBC, Adobe, and hundreds of smaller companies. Slack is marketed as a tool to maximize your time-management potential and allow everyone to stay in contact, but with its mobile app it has become a 24-hour addiction for many office workers.
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