Each of these beta customers formed an atomic network—a stable, self-sustaining group of users who can drive a network effect. Once an atomic network was formed in one of their beta testers, Slack would continually add users, become more useful, ramp up engagement, and ultimately become the de facto method of communication within their workplaces. The minimum number of people to be defined as a team, even today at Slack, is three. As long as you have three people, it can be stable. But it’s even better if there’s a larger team of fifty people in an organic unit—like a department—or an entire
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