Table 2.

Risky health behaviors and their associated social media platforms.

Risky health behaviors	Number of studies (N=64), n (%)a	Social media platforms and study references
Nicotine use	28 (44)	Twitter [40,41,43,47,48,50-52,54,58-61,63,66,67] QuitNet [45,55,56,64,65] Facebook [49,53] Reddit [42] Instagram [44] Cancer Survivors Network [57] BecomeAnEX.org [46] Vapor Talk, Hookah Forum, and Stopsmoking subreddit [62]
Drug and substance abuse	14 (22)	Twitter [68-70,73-81] Instagram [72] Facebook [71]
Alcohol use	12 (19)	Twitter [82,83,88,92] Facebook [85,87,93] Patient.info/forums [84] BecomeAnEX.org [86,91] A-CHESSb online discussion forum [89] Hello Sunday Morning blog [90]
Physical activity	3 (5)	Twitter [94-96]
Obesity-related behaviors	3 (5)	Reddit [97] Twitter [98,99]
Multiple behaviors (ie, e-cigarettes and marijuana, smoking and drinking, and physical activity and obesity-related behaviors)	4 (6)	Twitter [100,102] Reddit [101,103]

^aPercentages do not add up to 100 due to rounding.

^bA-CHESS: Addiction–Comprehensive Health Enhancement Support System.