“…Arguably, however, the greatest challenges for researchers in this area are ethical ones (David, 2004; Eysenbach and Till, 2001), such as variable perceptions of and unclear boundaries between ‘public’ and ‘private’ spaces, as well as the difficulty of ensuring anonymity and preserving the privacy of data subjects, whose identities may not be disguised or may be easily deduced from their postings and affiliations. Related issues of ownership and intellectual property are also poorly defined and consent to the use of social media data in research is rarely obtained through informed choice, but rather assumed on the basis that users have chosen to place it in the public domain (Koene and Adolphs, 2015; McKee, 2013; Munson et al, 2013; Nunan and Yenicioglu, 2013; Orton-Johnson, 2010; Vayena et al, 2012). Awareness of the potential privacy implications of sharing personal information on social media is growing, driven by newsworthy cases such as Facebook’s experiments in emotion manipulation (Jouhki et al, 2016) and its identification of ‘vulnerable’ teenagers for advertisers (Pells, 2017), or the use of social media by data analytics companies seeking insights into citizens’ political attitudes and networks, to influence voter behaviour (Fromm, 2016; Arthur, 2010).…”