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They use Slack or Teams.

There’ll be channels to talk about random stuff, or about fantasy football, or to post pictures of their cats, or whatever.

I’m not sure why this is even a question?

Do you have any particular topics in mind?

Why would they prefer internal forums for something not directly related to their work such as AI or philosophy say?

Because they want to discuss these things amongst the community they spend all day with, as opposed to random people on the internet.

They usually work so there is no time to chat about philosophy.

But if you have a very specific topic around, you can create groups with Teams.