Case 2: HIV screening via social media (Conditions 3 and 7) HIV/AIDS has become a distinctive case in the history of epidemiology as the disclosure of infection is widely considered to put seropositive individuals at risk of stigmatization and violence. The WHO has particularly emphasized the preservation of individual human rights against a strong public health interest, as the stigma of HIV “threatened to drive infected persons to conceal their status” (Fee and Parry 2008). With the advent of new prevention measures such as PrEP (pre-exposure prophylaxis), the widespread availability of rapid test kits and an increasing presence of risk groups on social media, DE has been suggested to solve some of the newly emerging problems in HIV surveillance and prevention. To this end studies have already tried to determine implicated health-related attitudes and behaviours on Twitter in order to fine-tune the coordinates of intervention (Young et al., 2014). Furthermore, DE is particularly praised to provide new ways of increasing the quality of surveillance data on MSM (Men who have sex with men), as traditional public health strategies seem to be failing (Young, 2015).