Chatter, which was launched two years ago, is not the only company working on a metric for influence within organizations. Yammer and National Field, other enterprise social networking tools, are also taking a stab at the problem.
The most progressive organizations have always realized that the informal connections employees make with others and the amount of knowledge and expertise they share outside of prescribed work responsibilities contributes mightily to the bottom line. But until now, they haven't had an empirical way of measuring that activity.
via fastcompany.com