Well, despite my earlier post about RockMelt it seems to be the closest thing to what I need. My search for something better came up dry. Despite it’s shortcomings RockMelt does give easy access to my various social networks. I also tried out various FireFox add-ons. None I found accomplished what I wanted. RockMelt also has a faster response time than Safari or Firefox. I would still like to see an option for a truly aggregated feed stream as well as a means of posting to multiple social networks simultaneously. In other words, I guess it was more like Flock (or at least had the option of being so).
Oh well. I shall make my suggestions known to the folk at RockMelt and see what comes about.