Anyone in sales will tell you that social networks are critical: The more contacts you have, the more leads you’ll generate and, ultimately, the more sales you’ll make. While there’s some truth behind that thinking, it’s a vast oversimplification. Different configurations of networks produce different results, and the salesperson who develops a nuanced understanding of social networks will outshine competitors.

A version of this article appeared in the July–August 2006 issue of Harvard Business Review.