TY - JOUR A1 - Chunara, R. A1 - Bouton, L. A1 - Ayers, J.W. A1 - Brownstein, J.S. T1 - Assessing the online social environment for surveillance of obesity prevalence Y1 - 2013 DO - 10.1371/journal.pone.0061373 VL - 8 IS - 4 ER -