Good summary of Social Network Aggregators. However, It seems to miss Plaxo which does a pretty good job of pulling together threads from across your Social Networks and then linking it in to your Address book.
Plaxo is one of my must have tools.
So that's why the boss keeps me around!
Quoted: The Fast Interview: John Morreall on the link between humor and innovation, why authoritarian bosses fear humor, and the funniest CEO in America.