Does anyone know if there's any software of any kind (app, script, program...) of any platform that allows mass deletion of Facebook conversations?
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No, there is not. Facebook applications can only delete content they own/posted. In addition Facebook doesn't deal in the negatives, so applications like these are swiftly banned/deleted.
Even if you got a script to automatically click delete in a browser simulated window, your account would be disabled faster than the script would finish.