Email patterns can predict impending doom?

This is interesting:

[R]esearchers found that the biggest changes [in email trends] actually happened around a month before [a crisis]. For example, the number of active email cliques, defined as groups in which every member has had direct email contact with every other member, jumped from 100 to almost 800 around a month before the December 2001 collapse. Messages were also increasingly exchanged within these groups and not shared with other employees….Menezes thinks he and Collingsworth may have identified a characteristic change that occurs as stress builds within a company: employees start talking directly to people they feel comfortable with, and stop sharing information more widely.