title: Assessing the online social environment for surveillance of obesity prevalence.
abstract: BACKGROUND
  Understanding the social environmental around obesity has been limited by available data. One promising approach used to bridge similar gaps elsewhere is to use passively generated digital data.
  
  
  OBJECTIVE
  This article explores the relationship between online social environment via web-based social networks and population obesity prevalence.
  
  
  METHODS
  We performed a cross-sectional study using linear regression and cross validation to measure the relationship and predictive performance of user interests on the online social network Facebook to obesity prevalence in metros across the United States of America (USA) and neighborhoods within New York City (NYC). The outcomes, proportion of obese and/or overweight population in USA metros and NYC neighborhoods, were obtained via the Centers for Disease Control and Prevention Behavioral Risk Factor Surveillance and NYC EpiQuery systems. Predictors were geographically specific proportion of users with activity-related and sedentary-related interests on Facebook.
  
  
  RESULTS
  Higher proportion of the population with activity-related interests on Facebook was associated with a significant 12.0% (95% Confidence Interval (CI) 11.9 to 12.1) lower predicted prevalence of obese and/or overweight people across USA metros and 7.2% (95% CI: 6.8 to 7.7) across NYC neighborhoods. Conversely, greater proportion of the population with interest in television was associated with higher prevalence of obese and/or overweight people of 3.9% (95% CI: 3.7 to 4.0) (USA) and 27.5% (95% CI: 27.1 to 27.9, significant) (NYC). For activity-interests and national obesity outcomes, the average root mean square prediction error from 10-fold cross validation was comparable to the average root mean square error of a model developed using the entire data set.
  
  
  CONCLUSIONS
  Activity-related interests across the USA and sedentary-related interests across NYC were significantly associated with obesity prevalence. Further research is needed to understand how the online social environment relates to health outcomes and how it can be used to identify or target interventions.
authors: Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, United States of America. rumi@alum.mit.edu
authors: Rumi
authors: R
authors: Chunara
authors: Lindsay
authors: L
authors: Bouton
authors: John W
authors: JW
authors: Ayers
authors: John S
authors: JS
authors: Brownstein
mesh_terms: D000293:Adolescent; D000328:Adult; D003430:Cross-Sectional Studies; D006801:Humans; D020407:Internet; D008875:Middle Aged; D009519:New York City; D009765:Obesity / Q000453:epidemiology* / Q000209:etiology*; D050177:Overweight / Q000453:epidemiology / Q000209:etiology; D015995:Prevalence; D062486:Public Health Surveillance; D012307:Risk Factors; D012931:Social Environment; D014481:United States; D014505:Urban Population; D055815:Young Adult
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