Excllent post...thank you. The situation can and does also exist on single platforms as well. I admin over 20 different Facebook pages and have to decide on how to cross post messages there first then of those how and where to cross post those on external networks. There are several services that facilitate "packet aggregation" such as Amplify.com, Posterous,com and the more sophiticated GaggleAMP.com which segments analytics. This is an increasing challenge that will get more difficult as more and more niche networks come online.