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New Cross-Company Slack DMs Are Cool, But They Aren't Private

Slack has launched a new direct-messaging feature that allows people from different companies to talk to one another. No problems there, right? The service is opt-in, in that you’ll have to approve anyone attempting to bother you on your work Slack before their messages appear—thank god. But that’s not the only quirk about Slack’s “Connect DMs” worth knowing about.