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Feb 11, 2016, 4:17 pm101 pts
Business Insider
Slack is a red-hot startup that makes a popular business messaging app. In less than 2 years, it's been able to get 2 million daily active users, and is now worth $2.8 billion. When you grow that fast, you're going to see competition, and Slack has been no exception. From the big guys like Facebook and…
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