Instead of having a hard reset of the entire thread at X time, I would keep a single live thread always on, and make the old messages disappear one by one when they're older than 24 hours.
That way you would have a more continuous flow of messages from people all around the world.
You might want to keep a log of these old messages though for future searches, those can be created after 24 hours have passed, like a snapshot of what was there at the live one.
+1 for the messages that disappear from the daily board after 24 hours.
This is already a familiar format for people using apps like Snapchat/Instagram/Facebook.
Everyone knows things disappear after 24h, and there is always something new to see whenever you check in.
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