At a time when medical conditions that can be prevented or managed with lifestyle changes are reaching record prevalence, such as obesity and type 2 diabetes, colleagues and I argue that learning when and how social media can appropriately and effectively help promote and support healthy behavior is a critical research challenge (Hesse 2010). I have been studying one piece of this larger challenge, specifically, how can, and when should, designers of wellness activities integrate their interventions with social network sites such as Facebook to help people increase or maintain their wellness?