I think the best way to solve this is to have a toggle that removes all the archived messages. That's actually one piece of Facebook system that is awesome - th

I think the best way to solve this is to have a toggle that removes all the archived messages. That's actually one piece of Facebook system that is awesome - there's no history at the bottom of every message that just gets longer and longer, because every message is a part of the history. Gmail has an alright workaround - they manage to hide the content they view is copied from a previous message. I don't know if explicitly breaking the thread would do anything - usually when a thread gets too long, I just change the subject line, problem solved.