Table 1.

Characteristics of the included studies.

Study	Setting	Target audience of behavior	Desired behavior change	Social media platform used	Length of follow-up
Garett et al [23]	Lima metro area, Peru	MSMa adults at high risk of HIV	HIV testing	Facebook	1 year
Young et al [24]	Lima metro area, Peru	MSM adults at high risk of HIV	HIV testing	Facebook	1 year
Harding et al [25]	Ghana	People who breastfeed or might be in a position to support or promote breastfeeding	Breastfeeding and supporting breastfeeding	Facebook and Twitter	No information available
Cao et al [26]	Guangdong and Shandong provinces, China	MSM aged >16 years	HIV testing	WhatsApp	3 months
Sap et al [27]	Cameroon	Adolescents and young adults living with diabetes	Diabetes knowledge and glycemic control	Not specified	2 months
Cole et al [28]	Kerala, India	People living in the area of a Nipah virus outbreak	Nipah virus knowledge	Reddit	No information available
Hutchinson et al [29]	Kenya	Adolescents and young adults	Increased knowledge and changed behaviors around family planning and income generation	Facebook, Twitter, Instagram, YouTube, and WhatsApp	1 year
Goldenhersch et al [30]	Buenos Aires, Argentina	Smokers aged between 26 and 65 years	Tobacco cessation	Created for the intervention	90 days
Cool et al [31]	The Philippines	General population	Emergency response to typhoon	Facebook, Twitter, and Instagram	No information available
Hamill et al [32]	Alexandria, Egypt	General population	Build awareness and support for an upcoming smoking ban	Facebook	1 month
Jiebing et al [33]	Tibet	Pregnant women	Increase number of prenatal care visits	WeChat	Length of pregnancy
Mo et al [34]	Shanghai, China	Undergraduate students	Increased physical activity	WeChat	7 weeks
Wu et al [35]	Guangzhou and Shenzhen, China	MSM	Increase STIb testing and other health-seeking activities	Created for the intervention	No information available
Ahmad et al [36]	Selangor, Malaysia	Parents and their primary school-going children (aged 8-11 years) who were overweight or obese	Physical activity, healthy diet, and reduced screen time	WhatsApp and Facebook	6 months
Cavalcanti et al [37]	João Pessoa city, Brazil	Mothers who recently gave birth	Breastfeeding	Facebook	6 months
Chen et al [38]	China	Chinese men aged 25-44 years who smoke tobacco	Smoking cessation	WeChat	6 weeks
Todorovic et al [39]	Belgrade, Serbia	First and fifth-year medical students	Physical activity	Facebook	1 month
Chai et al [40]	Zhongshan City, Guangdong Province, China	Employees of labor-intensive manufacturing factories aged >16 years	Smoking cessation	WeChat	1 month
Lwin et al [41]	Sri Lanka	General population	Dengue knowledge and prevention strategies	Created for the intervention	No information available
Pereira et al [42]	Brazil	General population	Uptake of HPVc vaccine	Facebook	No information available
Gamboa et al [43]	La Vega, San Francisco, and Puerto Plata; Dominican Republic	Youth aged 14-18 years in communities at high risk for arboviruses	Zika prevention behaviors	Facebook	No information available
Januraga et al [44]	Indonesia	Urban, unmarried adolescent girls aged 16-19 years	Healthy diet	Facebook, Instagram, YouTube, and another app created for the intervention	No information available
Thammasarn and Banchonhattakit [45]	Nakhon Ratchasima Province, Thailand	Senior-primary school students	Physical activity and healthy diet	Not specified	No information available
He et al [46]	China	General population	Weight loss	WeChat	No information available
Souza et al [47]	Brazil	Community leaders	Civic engagement in general public health work	WhatsApp	No information available
Chiu et al [48]	Peru	MSM	HIV prevention and testing	Facebook	No information available
Chiu et al [49]	Peru	MSM	HIV prevention and testing	Facebook	No information available
Purdy [50]	Turkey	General population	Condom use	Facebook	No information available
Parsapure et al [51]	Kermanshah, Iran	General population	Vaginal health	Not specified	6 months
Wu et al [52]	Huzhu County, Qinghai Province, China	Breastfeeding mothers aged >17 years	Breastfeeding	WeChat	5 months
Hutchinson et al [53]	Ghana	Adolescent girls	Refusal to smoke tobacco	Facebook, Instagram, and YouTube	No information available
Diamond-Smith [54]	India	Women aged between 18 and 49 years	Anemia-related knowledge	Facebook	5 months
Chang et al [55]	Zhejiang Province, China	General population	Physical activity and healthy diet	WeChat	No information available

^aMSM: men who have sex with men.

^bSTI: sexually transmitted infection.

^cHPV: human papillomavirus.