Published on in Vol 18 , No 8 (2016) :August

1 Positive Psychology Center , University of Pennsylvania , Philadelphia , PA , US
2 Penn Medicine Social Media and Health Innovation Lab , Penn Medicine Center for Health Care Innovation , University of Pennsylvania , Philadelphia , PA , US
3 Happify , New York , NY , US
4 Computer Science , Stony Brook University , Stony Brook , NY , US
5 Department of Psychology , Hiram College , Hiram , OH , US