Slack turns one year old today. In its short but fascinating
history, the startup has managed the remarkable feat of actually
getting people excited about enterprise communication software.
The company has more than 500,000 daily active users, and it’s
adding tens of thousands more every each week.
“That’s our primary metric,” founder and CEO Stewart Butterfield
tells Quartz. “If you’re not using Slack every single day, you’re
not really using it.”