“…Of these, 28 studies focused on an element of the content itself as the unit of analysis, either on particular platforms (for example videos about recovery from selfharm on YouTube (Ryan-Vig et al, 2019) or tweets about self-harm or suicide (Hilton, 2017;Lee and Kwon, 2018;Spates et al, 2020) or posted content across different media (for example images tagged as self-harm (Shanahan et al, 2019) or posts tagged with #cutting (Miguel et al, 2017). The remaining 23 studies engaged to some extent with the interactivity of platforms by following particular threads on discussion boards or chats (Niederkrotenthaler, et al, 2016;Niederkrotenthaler and Till, 2019;Williams et al, 2020) or analysing comments and responses in addition to the original posts (Carlyle, et al, 2018;Dagar and Falcone, 2020;Tao and Jacobs, 2019). Some studies highlighted content they regarded as explicitly harmful, such as the use of Twitter to make suicide pacts (Lee and Kwon, 2018), active encouragement to suicide in response to expression of suicidal thoughts (Brown et al, 2019;O'Dea et al, 2018) and baiting or jeering in response to suicide attempts (Li et al, 2015;Ma, et al, 2016;Phillips and Mann, 2019;Westerlund et al, 2015).…”