Understanding What Drives Long-term Engagement in Digital Mental Health Interventions: Secondary Causal Analysis of the Relationship Between Social Networking and Therapy Engagement

Shaunagh O'Sullivan   ^{1, 2} , BA, MPsychSc ;   Niels van Berkel   ³ , PhD ;   Vassilis Kostakos   ⁴ , BSc, PhD ;   Lianne Schmaal   ^{1, 2} , BA, MSc, PhD ;   Simon D'Alfonso   ⁴ , BASc (Hons), PhD ;   Lee Valentine   ^{1, 2} , BA, MSocWk, PhD ;   Sarah Bendall   ^{1, 2} , BA, PGDipClinPsych, MA, PhD ;   Barnaby Nelson   ^{1, 2} , MPsych, PhD ;   John F Gleeson   ^{5, 6} , BA (Hons), MPsych, PhD ;   Mario Alvarez-Jimenez   ^{1, 2} , DClinPsy, MAResearchMeth, PhD

¹ Centre for Youth Mental Health, University of Melbourne, Melbourne, Australia

² Orygen, Parkville, Australia

³ Department of Computer Science, Aalborg University, Aalborg, Denmark

⁴ School of Computing and Information Systems, University of Melbourne, Melbourne, Australia

⁵ Healthy Brain and Mind Research Centre, Australian Catholic University, Melbourne, Australia

⁶ School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia