On platforms like Facebook or YouTube where the feed is algorithmically generated and you can't easily view a filtered list of topics (like Reddit) something like this would be very easy.
The interactions don't even need to be generated by AI, it just needs to keep you seeing interactions with other people in your social status circle. And if you try to venture too far outside of that it shadow bans you.
Heck I'd be surprised if the way the news feed algorithms work today they don't already do something like this, as a byproduct of optimising for viewership.
They'd just need to take it a bit further by preventing you from seeing viewpoints outside your circle. So taking the WWII example, people in the Nazi group would not be able to see pro-Ally content. All they'd see about Allies would be content that paints them in a bad light, and vice versa.
