Facebook is becoming more than a live-action yearbook .
But earlier this week the new edition of the china statistical yearbook arrived on my desk with a thud .
A grim expression in a yearbook photo or family snapshot could mean more than just a passing bad mood .
Sipri 's yearbook also lists the top 100 arms producing companies , excluding chinese ones , for which figures were unavailable .
The research team examined participants ' positive expressive behavior in college yearbook photos in the first phase , and then a variety of participants ' photos from childhood through early adulthood in phase two .