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I suspect an effective method could be built, and I would use such a method if it existed. However, any method would violate the sandboxing that has become vogue as we attempt to monetize the Internet. RSS didn't go away because it didn't work. RSS went away because it wasn't the most efficient way to sell advertising. Putting together a "look - this other service over there with a completely different ad network is also talking about this! Go over there!" service is a quick way to lose money.