Borenstein Prochaska Assessment of the risk of bias for the included studies. JO Baker However, it is important to remember that aspects like random sequence allocation and allocation concealment are frequently under-reported, not necessarily meaning that adequate procedures were not followed.69,70 Additionally, blinding is seldom possible in web-based interventions. . It is unclear whether the observed effects in studies with multi-component interventions are attributable either to the SNS or the non-SNS component, or to a synergistic effect of both. The reference lists of relevant articles were also screened. Rimer NA Data concerning Facebook use were provided in three studies.37,39,40 Two studies reported usage data regarding website access.34,38 Finally, one study reported podcast downloads, mean days per week of self-monitoring activity, and number of tweets.36 Four studies reported having conducted dose–response analysis.34,36,38,39 The four studies that evaluated engagement variation throughout the study duration reported its decline, both in the intervention and in control groups.34,36,38,39. Murray Harrison Valle Ramirez-Cano Boyd C . Graham social comparison, companionship, social … Fowler Wicks How the Social Cognitive Theory is Applied to Health: The Social Cognitive Theory can be applied to health and health promotion through its focus on personality development and behavior pathology in order to understand an individual's reality construct (3). Materials and methods Five databases were scanned using a predefined search strategy. et al. Green SD Rice Finally, among the participants of the 12 included studies, there appeared to be a preponderance of young adults, which is in line with previous characterizations of SNSs’ common users.3. Social Networks. S et al. . The scarcity of single-component interventions has been previously reported regarding social media and other web-based interventions,49–52 posing problems in determining the effectiveness of a particular component. et al. We found a slight positive effect of SNSs on health behavior-related outcomes (Hedges’ g 0.24; 95% CI 0.04 to 0.43) (figure 2). Hazlett Rosenquist . KMV PT-L Screening of the reference lists of the remaining 11 papers revealed an extra study that met our pre-defined criteria. CA This work was supported by a Junior Clinical Research award from the Harvard Medical School-Portugal program (HMSP-ICJ/0005/2010; Fundação para a Ciência e Tecnologia) awarded to the first author. T Social relationships may influence health outcomes by influencing the practice of health-related behaviors, including preventive and lifestyle behaviors, treatment adherence, and illness-management behaviors. Poirier H N J . It is well documented that belonging to a social network characterized by mutual support leads to better health outcomes, and there is great interest in understanding the mechanisms underlying this relationship. DB Valente Studies were included if they focused on patients/consumers, involved an SNS intervention, had an outcome related to health behavior change, and were prospective.