[dekhn]

google tried to prevent teams from using slack "for security reasons" but then deepmind got an exception, and enough people had to join slack groups for external work collaborations, but I don't think the leadership ever explicitly sanctioned slack as an officially supported internal mechanism.

[morgante]

The vast majority of team communication at Google goes through Chat. The only Slack usage I know of is acquisitions (who are encouraged to move off it) and interaction with customers/partners.

[dekhn]

worked there for 12 years. deepmind uses slack. many other teams do to. Unofficially.