Monitoring employees with social network analysis

PC World writes about social network analysis software, called Metron EBA, that does "Enterprise Behavior Analysis": 

The appliance sits on the network, takes a snapshot of its users and passively monitors traffic, tracking various modes of communication such as data, voice, e-mail or IM. Metron EBA can then display which employees or groups of employees interact the most and how it relates to business productivity. For instance, one employee may be connected to several groups and serve as an unofficial liaison, unbeknownst to upper management.

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Metron EBA also could be used to optimize business processes, conveying which groups of people work together and what it makes sense for them to work on at any given time. In addition, the product could indicate if an employee is using different communications or speaking with people outside of the normal behavior -- which could indicate malicious behavior ...

The Green Chameleon calls it a "nasty twist" on the technique's formerly benign image, while Brad Hinton says it won't help recruit and retain staff.