A hat tip to Allan Engelhardt who writes;
If you are at all interested in enterprise social software, then the article A Practical Guide to Social Networks from the March 2005 issue of the Harvard Business Review is required reading. No excuses accepted. The lead author is Rob Cross, whose book The Hidden Power of Social Networks we have previously reviewed and recommended.
Our own take on some of Rob's work was in our Energisers post. Bruce Hoppe and Patti Anklam have also made mention of Rob's work.