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There's a lovely manifesto on the 37signals (ex-Basecamp) website.
They have the controversial "no-politics" rule mentioned, but that doesn't make the rest of the 36 lesser.
@nikoheikkila That doesn't solve the problem of marking certain opinions as "political" while other, "approved" ones can be discussed freely.
"Politics" is anything you don't agree with.
My take on political discussions in work-related channels:
Write them if you absolutely must, but always add a content warning, so people who don't want to subscribe to your politics don't have to read them.
Slack tip: open a new thread with the message "CW: <topic>" and then add your thoughts as replies to that thread.