Table 3.

Characteristics of included studies (N=33).

Study characteristics			Studies, n (%)
Country
	China	8 (24)
	Peru	4 (12)
	Brazil	3 (9)
	Othera	19 (58)
Social media platformb
	Facebook	17 (52)
	WeChat	8 (24)
	Instagram	4 (12)
	Platform created for intervention	4 (12)
	YouTube	3 (9)
	WhatsApp	3 (9)
	Twitter	3 (9)
	Reddit	1 (3)
	Multiple platforms	6 (18)
Methodologic quality
	The role of social media in this intervention or outcome was clearly reported	24 (73)
	This role was quantified through clicks, shares, comments, or other method of engagement	14 (42)
	Social media was described as effective	22 (67)
	A theoretical or conceptual model was used	10 (30)

^aArgentina, Cameroon, the Dominican Republic, Egypt, Ghana, India, Indonesia, Iran, Kenya, Malaysia, Serbia, Sri Lanka, Thailand, the Philippines, and Turkey.

^bCategories are not mutually exclusive.