I belong to two political groups on FB of friends and friends of friends.
They are private, by invitation only. Members are welcome to invite anyone; new members are welcome to stay and say anything, liberal or conservative, as long as it isn’t spammy, astroturfing, or so loud that others can’t have a conversation. The only other rule is that you don’t whine, because it is all politics, all the time, and no, we can’t all get along.
Most of us are conservative or libertarian. Liberals don’t seem to make it far without flaming out in a hissy fit. Maybe 5 out of several dozen have stayed over the years.
Some members live in the UK, Canada, Australia, and elsewhere. They are welcome to talk about our politics or their own. I have learned a ton about the politics of other nations this way. Members invite new members, not just the owners or moderators. If you invite someone, you vouch for them not being spammers or too off-the-wall.
I get all of my FB political needs met there. I don’t ever post politics to the main feed, and rarely comment on those who do. I am good at walking away and agreeing to disagree without name calling, and it works best if that is your philosophy.
Groups are free to start. Start one, invite a few kindred spirits, and have at it.
Thanks for the advice!