You can't just pull that information from your site unless your site is giving that information out. Turning on the external feed only outputs thread data. This means you will have to either do a query to grab that information (possible if your sites are on the same server utilizing the same database that your have complete access to), or you will have to write some code to feed that information out to other sites. Well, or write some code to feed the information out to a text file and then write some code to run on the other site that grabs the info from the text file and does something with it. Those are the only ways I can think of right now for you to do what you want.
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