This script allows you to purge your Reddit account from data. It updates all posts/comments with dummy text then deletes the content. Reason for this is that if you just deactivate your account your posts are not deleted.
Use at your own discretion. Note: we have no idea if data is actually deleted from backups but based on my testing it does seem to remove content from the site. Of course anyone could crawl the site hoovering it up before you delete it.