Table 1.
Summary of characteristics of included studies (N=71).
| Study characteristics | Value, n (%) | |
| Country | ||
| High-income countries | 65 (92) | |
| Upper–middle-income countries | 5 (7) | |
| Lower–middle-income countries | 1 (1) | |
| Study design | ||
| RCTa | 60 (85) | |
| Non-RCT | 11 (15) | |
| Types of social media | ||
| Tailored interactive website only | 31 (44) | |
| Facebook only | 23 (32) | |
| Tailored interactive website and other social media components (Facebook and interactive apps) | 13 (18) | |
| Twitter or WhatsApp or WeChat | 3 (4) | |
| Twitter and other social media components | 1 (1) | |
| Types of outcomesb | ||
| Health-related behaviors | 40 (56) | |
| Physical health | 25 (35) | |
| Well-being | 11 (15) | |
| Psychological health | 8 (11) | |
aRCT: randomized controlled trial.
bMore than one outcome per study.