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Perhaps something that reads the page for phrases that come up frequently, so quoted text in the comments, or things the author says repeatedly. Additionally, maybe bolded or italicized text, so you see where the author put emphasis (I don't know if that's common. I refuse to give them traffic to find out) and then it makes a small preview window on the page you're on to view those select pieces of text. It would be great for Buzzfeed and Cracked as well.