@Jean-Claude. I think you've hit the nail on the head actually. YOu certainly don't want to see every molecule coming through on the feed. I would probably want to see the new molecules you've made, but perhaps someone else is interested in the molecules you are getting in. This is why the rich feed is so necessary. I agree at the moment that a google seach is perfectly capable of serving the person to person needs. Where I am thinking is the machine to machine or person through machine to other machines communication that you have often talked about. Using that little green double headed arrow in my picture above to make those aggregating filters work really effectively.

@Fang, Hi! I'd not really thought about it from a social network perspective but I agree that the most effective filters of complex information are people. I'm hoping to get machines to do the simple stuff more effectively as well. What I'm really dreaming about is an aggregator that notices that I should be reading papers by Professor X because his feed is aggregating data that is one step removed from the data that I am aggregating or searching for.