Online social networking is a pervasive but empirically understudied phenomenon. Strong public opinions on its consequences exist but are backed up by little empirical evidence and almost no causally conclusive, experimental research. The current study tested the psychological effects of posting status updates on Facebook using an experimental design. For 1 week, participants in the experimenta...

JEL Classification: I120, Z130 Twenty-seven percent of the Union Army prisoners captured July 1863 or later died in captivity. At Andersonville the death rate may have been as high as 40 percent. How did men survive such horrific conditions? Using two independent data sets we find that friends had a statistically significant positive effect on survival probabilities and that the closer the ties...

BACKGROUND Evaluations of school-based anxiety prevention programmes have reported improvements in psychological functioning although little is known about their effect upon educational outcomes. METHODS One thousand three hundred and sixty-two children from 40 primary schools in England took part in the randomised controlled trial, Preventing Anxiety in Children through Education in Schools....