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Re:Please don't use Slack for FOSS projects by twelvenmonkeys on Sunday November 01, 2015 @05:50PM (#10488793)
Except WhatsApp and until recently, Google Chat / Hangouts.
Re:Please don't use Slack for FOSS projects by ash on Sunday November 01, 2015 @06:29PM (#10488975)
Yes, thank you. But none of them support XMPP federation (only Google supported it the past).

And I would add Facebook to your "until recently" example.