The Most Valuable People in Your Network - Rob Cross - Harvard Business Review
Michael Simmons stashed this in How To Be A Super Connector
"Simply following the advice of self-help books and building mammoth Rolodexes or Facebook accounts actually tends to hurt performance as well as have a negative effect on health and well-being at work. Rather, the people who do better tend to have more ties to people who themselves are not connected. People with ties to the less-connected are more likely to hear about ideas that haven’t gotten exposure elsewhere, and are able to piece together opportunities in ways that less-effectively-networked colleagues cannot."