Team communication apps Slack today is announcing the launch of user groups for teams that pay for premium tiers of service. The feature provides more granularity than the channels for group discussions that existed since the app’s earliest days.

User groups also make onboarding easier. People who join existing user groups can automatically be added to certain channels, Slack wrote in a blog post on the news.

Slack today also released new usage numbers: 1.7 million daily active users and 470,000 paid seats. That’s up from 1.1 million daily active users and 300,000 paid seats four months ago.

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