Not sure if this was posted before, but to get rid of people bumping their own post when no one else responds to it, just take off the reply button for a person's own post, and that way, they can't reply but they can still edit.
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If you are responding to a post and adding something to what the previous person said, then its not post bumping. If your whole post says "What he said" well then your post may be considered bumping because there really is no need.