Results: At 6 months, the intervention group increased leisure
walking minutes by 164% compared with 47% in the control group. The intervention group also lost more weight than the
controls (5.2 pounds compared with 1.5 pounds). There were no observed significant differences in vigorous exercise or
clinical indicators between the 2 groups. Among intervention participants, greater OSN use, as measured by number of
private messages sent, was associated with a greater increase in leisure walking and greater weight reduction over the study
period. Conclusions: The study provides evidence that interventions using OSNs can successfully promote increases in
physical activity and weight loss.

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