“…Among all the 60 included articles, 51 (85%) took advantage of the forum-like subreddit feature for data collection, and 38 (63%) reported the names of the subreddits that had been used. The top 3 most adopted drug-related subreddits were r/opiates (14/60, 23%) [27,[30][31][32]36,38,39,50,51,[54][55][56]58,59], r/OpiatesRecovery (12/60, 20%) [10,[30][31][32]36,38,39,46,50,51,54,58], and r/Drugs (6/60, 10%) [27,28,51,52,58,75]. The top 3 subreddits adopted for tobacco-related studies were r/stopsmoking (4/60, 7%) [19,45,60,63], r/electronic_cigarettes (4/60, 7%) [18,45,60,69], and r/vaping (3/60, 5%) [18,60,69].…”