I don’t think you can build a real-time conversation platform like Twitter without trending topics.
Trending topics allow people to participate in a conversation about what is happening right now which includes entertainment events (concerts, NFL games, the Grammies, etc), movements (#BlackLivesMatter, #MeToo) and breaking news (e.g. Hamas attacks in Israel).
The problem is once you amplify movements and breaking news, you get misinformation & culture wars. They’re like peanut butter & jelly.