“…Researchers have employed big data methods in the study of depression support groups on the internet: they studied the language used in the groups (Carron-Arthur, Reynolds, Bennett, Bennett, & Griffiths, 2016;Gkotsis et al, 2017;Xu & Zhang, 2016), predicted users leaving the groups (Sadeque et al, 2016) or showed long-term effects of participation (Park & Conway, 2017). Other health-related issues that have been explored using big data methods include smoking cessation (Zhao et al, 2016), suicidal ideation (De Choudhury & Kiciman, 2017), cancer (Wang, Kraut, & Levine, 2015), HIV/AIDS (Wang, Shi, Chen, & Peng, 2016), and obesity (Chou, Prestin, & Kunath, 2014). A number of systematic reviews have been conducted on all kinds of topics related to research using social media, online communities, and support groups (Carron-Arthur, Ali, Cunningham, & Griffiths, 2015;Eysenbach, Powell, Englesakis, Rizo, & Stern, 2004;Moorhead et al, 2013;Seabrook, Kern, & Rickard, 2016;Sinnenberg et al, 2017;Wongkoblap, Vadillo, & Curcin, 2017).…”